If you've been reading articles about dating a vintage guitar, you may well have come across mention of pot codes, and the concept of using pot codes to date your guitar. The pots, or potentiometers to give their full name, are the variable resistors that control volume and tone. Better quality pots are often stamped with a number of codes; typically part numbers, date of production, manufacturers codes and resistance values. Many pots don't carry all of this information, but the better quality guitars produced in America usually do.
So where are these codes? Normally they are stamped or inked onto the back or sides of the pot. So reading them will require opening control cavities, removing scratchplates, or in the case of a semi acoustic, removing the pots entirely. Codes can be faded, worn, obscured by solder and other components, or simply very small. Finding them is not always easy; this is obviously not something for the faint-hearted, but once performed a few times, nowhere near as daunting as it might at first seem. There are many exceptions and variations to the general rules described below, some of which are highlighted in the examples at the end. But read on, dating a vintage guitar with pot codes is sometimes more reliable than dating with serial numbers!
Many pots do not have part numbers, but the larger guitar manufacturers did list pots by part number in their spare parts manuals. You can look up Gibson potentiometers by their part number in the Gibson pot index on this site.
There are very many electronic companies worldwide producing potentiometers, but most American vintage guitars of the 20th Century used pots by just a few manufacturers. American pot manufacturers had their own numerical EIA (Electronic Industries Alliance) codes, for example 134 = Centralab, 137 = CTS and 304 = Stackpole. Although many others were used, these are by far the most important, as they were widely used by the likes of Gibson, Fender, Guild and Epiphone. Other worldwide manufacturers just used the company name rather than a code. Some also put a country of production.
Production dates regularly appear on potentiometers, though usually encoded to some extent. Each company had it's own dating system, although there was some consensus, particularly in American parts. Other companies from around the world used different systems using letters to denote differing years and months. Sometimes these are simple, sometimes exceptionally complicated (for no useful reason!).
Date codes were usually in three or four digits, one or two digits giving the year (for many US pots one digit refers to the 1950s, two digits to the 1960s), and two giving the week of the year. These often run on from the manufacturer code. For example 1346120 is a Centralab pot (134) produced in the 20th week of 1961. These are some of the simplest codes to read, and it is therefore unsurprising that this system has become standard.
Egen Electric Limited were a British electronics supplier whose pots were widely used in guitars by Vox, Fenton Weill, Hohner and others. They do not use an EIA code, but are easily identifiable, typically having EGEN stamped onto the top of the pot (next to the shaft) and a tape covering the data on the side of the pot. Egen potentiometers have a simple two letter date code in the format MY (although occasionally they used YM). The month code ran A-I (Jan-Dec). The year code may not encompass the entire alphabet (then again it may), but the most relevant section covering British guitar construction (early-mid 1960s) ran H-O (1960-1967). So an Egen date code of 'JK' means October 1963 (J = October, K= 1963).
| code | month | code | year |
|---|---|---|---|
| A | Jan | I | 1961 |
| B | Feb | J | 1962 |
| C | Mar | K | 1963 |
| D | Apr | L | 1964 |
| E | May | M | 1965 |
| F | Jun | N | 1966 |
| G | Jul | O | 1967 |
| H | Aug | ||
| I | Sep | ||
| J | Oct | ||
| K | Nov | ||
| L | Dec |
Morganite pots were commonly fitted to British Vox guitars. Although they do not have an EIA manufacturer code, they are quite distinctive - small (about 3/4" diameter), with a brown plastic back with Morganite in raised lettering. Interestingly, these pots used more than one dating system, sometimes using numerals in the format WWY (typically early 1960s), and sometimes, a letter-based format, similar to the Egen codes above. However these were in the format YM (but, as with the Egen codes, they occasionally switched the letters to a MY format!). The month code differed from Egen, above, in that the letter I was skipped - to prevent confusion with the number 1 - so it ran A-M (Jan-Dec). Year codes for the relevant period ran S-X (1961-1967). Interestingly, some examples even had both a numeric and letter-based codes on the same pot. For example, a pot labelled 'TL 1MΩ LOG 462' had the numeric date code 462 (46th week of 1962 NOT 4th week of 62), and the alphabetical code TL (T = 1962, L= November).
| code | year | code | month |
|---|---|---|---|
| S | 1961 | A | Jan |
| T | 1962 | B | Feb |
| U | 1963 | C | Mar |
| V | 1964 | D | Apr |
| W | 1965 | E | May |
| X | 1966 | F | Jun |
| G | Jul | ||
| H | Aug | ||
| J | Sep | ||
| K | Oct | ||
| L | Nov | ||
| M | Dec |
Pot dates can be a useful tool in dating guitars. But remember this is the date that the potentiometer was produced. Pots in an older guitar may have been replaced, and this should be considered, especially if the date suggested does not fit with other features of the guitar. What's more, guitar companies sometimes took a very long time to use the potentiometer in question, and they may be considerably older than the guitar itself. Fender, famously bought huge stocks of pots in 1966, and took almost a decade to use them all. Conversely, guitars were also built, but not wired and shipped immediately, resulting in newer pots in older guitars. This is especially the case for guitars that were only ever shipped in tiny numbers. Pot dates are a useful tool in guitar dating, but should always be used in conjunction with other known factors, such as hardware changes and serial numbers.
Resistance values are normally listed. 250k, 500k and 1 Meg (1000k) being the most common. The taper of a pot describe how the resistance changes with the turning of the pot. The words LIN on a pot means a linear taper; turned half way, the resistance is at approx. 50% of maximum, three quarters of the way at 75% of maximum etc. Pots marked LOG or AT (which stands for audio taper) change logarithmically. As a general rule, volume pots have a logarithmic taper, and tone pots have a linear taper.
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Scan of 1971 Selmer guitar catalogue showing the range of electric and acoustic guitars distributed by the company: guitars by Gibson, Yamaha, Selmer, Hofner and Suzuki. 1960s Selmer had always placed Hofner at the front end of their catalogues, no doubt these were the better sellers - but into the 1970s Hofner were slipping somewhat and only appear at the tail end of this publication, pride of place going to Gibson, and to a lesser extent Yamaha. In fact this is the last Selmer catalogue to include the many Hofner hollow bodies (Committee, President, Senator etc) that had defined the companies output for so many years - to be replaced in the 1972 catalogue by generic solid body 'copies' of Gibson and Fender models. A number of new Gibson models are included for the first time: the SG-100 and SG-200 six string guitars and the SB-300 and SB-400 basses.
Scan of 1968/1969 Selmer guitar catalogue (printed July 1968), showing the entire range of electric and acoustic guitars distributed by the company: guitars by Hofner, Gibson, Selmer and Giannini. Selmer were the exclusive United Kingdom distributors of Hofner and Gibson at the time, and this catalogue contains a total of 18 electric guitars, 7 bass guitars, 37 acoustics, and 2 Hawaiian guitars - all produced outside the UK and imported by Selmer, with UK prices included in guineas. This catalogue saw the (re-)introduction of the late sixties Gibson Les Paul Custom and Les Paul Standard (see page 69) and the short-lived Hofner Club 70. Other electric models include: HOFNER ELECTRICS: Committee, Verithin 66, Ambassador, President, Senator, Galaxie, HOFNER BASSES: Violin bass, Verithin bass, Senator bass, Professional bass GIBSON ELECTRICS: Barney Kessel, ES-330TD, ES-335TD, ES-345TD, ES-175D, ES-125CD, SG Standard, SG Junior, SG Special GIBSON BASSES: EB-0, EB-2, EB-3 - plus a LOT of acoustics branded Gibson, Hofner, Selmer and Giannini
Hofner Colorama was the name UK distributor Selmer gave to a series of solid and semi-solid guitars built by Hofner for distribution in the UK. The construction and specifications of the guitars varied over the period of production, but by 1961 it was a totally solid, double cutaway instrument, with a set neck, translucent cherry finish, six-in-a-row headstock, and Hofner Diamond logo pickups. Available as a single or dual pickup guitar, this sngle pickup version would have been sold in mainland Europe as the Hofner 161.
Commodore was a brand applied to a series of guitars produced in Japan at the well-respected Matsumoku plant from the late 1960s to the mid 1970s - and sold primarily (perhaps exclusively?) in the United Kingdom. The models bearing the Commodore name were all guitars available from different distributors with different branding. Although there may have been some minor changes in appointments (specifically headstock branding) most had the same basic bodies, hardware and construction. Equivalent models to the Commodore N25 (and this is by no means an exhaustive list) include the Aria 5102T, Conrad 5102T(?), Electra 2221, Lyle 5102T, Ventura V-1001, Univox Coily - and most famously the Epiphone 5102T / Epiphone EA-250.
The Hofner Colorama was the name given by Selmer to a series of solid (and semi-solid) body Hofner guitars distributed in the United Kingdom between 1958 and 1965. The Colorama name actually applied to some quite different guitars over the period, but in 1960 it was a very light, semi-solid, set necked guitar with one (Colorama I) or two (Colorama II, as seen here) Toaster pickups. Although an entry-level guitar, it was very well-built, and a fine playing guitar; certainly a step up (at least in terms of craftsmanship) from many of the Colorama guitars that would follow, and a good deal of the guitars available in Britain circa 1960.
By the end of the 1960s, a decision had been made to move Epiphone guitar production from the USA (at the Kalamazoo plant where Gibson guitars were made), to Matsumoto in Japan, creating a line of guitars and basses significantly less expensive than the USA-built models (actually less than half the price). The Matsumoku factory had been producing guitars for export for some time, but the 1820 bass (alongside a number of guitar models and the 5120 electric acoustic bass) were the first Epiphone models to be made there. These new Epiphones were based on existing Matsumoku guitars, sharing body shapes, and hardware, but the Epiphone line was somewhat upgraded, with inlaid logos and a 2x2 peghead configuration. Over the course of the 70s, the Japanese output improved dramatically, and in many ways these early 70s models are a low point for the brand. Having said this, there are a lot worse guitars out there, and as well as being historically important, the 1820 bass can certainly provide the goods when required.
Production of Bill Lawrence's Gibson Marauder began in 1974, with production peaking in 1978. But by 1980 the model was officially discontinued, though very small numbers slipped out as late as spring 1981. Over 7000 examples shipped between 1974 and 1979, and although no totals are available for 1980 and 1981, it is unlikely production reached three figures in either of these years. These final Marauders were all assembled at the Gibson Nashville plant, and had some nice features not available through the later years of production, such as a rosewood fretboard, and in this case, an opaque 'Devil Red' finish. It's a great looking and fine playing guitar!
When Epiphone production moved from Kalamazoo to the Matsumoku plant in Japan, a whole new range of electric, flattop and classic acoustic guitars was launched. Between late 1970 and 1972 the new models were launched and refined. This 'folder' catalog contains various inserts released over these years detailing four electric six-strings (ET-270, ET-275, ET-278, and thinline EA-250), three bass guitars (ET-280, ET-285, and thinline EA-260), three folk/steel acoustics, four jumbo flattop acoustics, two 12-string jumbos, four classic acoustics, and a banjo.
'Gibson Specials' was part of the June 1981 pre-owners manual series, but unlike the other folders contained a mish-mash of different guitars: limited editions, test marketing and close outs. "You will find the unusual, the brand-new, and the bargain within this folder". End of line 70s guitars like the Marauder, S-1, and L-6S Custom mixed in with brand new models the The V, The Explorer and the Flying V Bass.
Rose-Morris were selling Shaftesbury-branded Rickenbacker copy instruments from the late 1960s right through the 1970s. The 3263 bass was one of the first models, (alongside the 3261 six string and 3262 twelve string) available from late 1968 until about 1974. The earliest incarnation was a set neck bass, produced very briefly in Japan. But production quickly moved to Italy. This bolt-on neck example was built by Eko, in Recanati, using the same hardware and pickups as fitted to Eko, and Vox basses built around the same time. It's certainly a fine looking bass, and not a bad player either.
This very early, and pretty rare British-built guitar is branded Hohner London. Hohner were, of course, a German company, better known for their harmonicas and accordions, but they were keenly expanding into guitars at the birth of the 1960s. This model, along with the Hohner Amazon and (particularly) the Hohner Holborn, bear some similarity with Vox guitars of the same period; furniture manufacturer Stuart Darkins constructed bodies and necks for both brands, with Fenton Weill assembling them using their hardware and pickups. These guitars do have some hardware peculiarities, and they are not the most adjustable of instruments, but they actually play very nicely, being solidly built out of some very nice woods. Check out the video on this page.
The Vox Super Ace was a mid-priced British solid body electric guitar, produced by JMI at their factory in Dartford, Kent. It was broadly modelled on the Fender Stratocaster, and a sibling model to the dual-pickup Vox Ace. Both the Ace, and Super Ace (along with several other models), were redesigned in 1963 with a new body shape, headstock style, and pickup layout - only increasing the resemblance to the aforementioned Fender. The Super Ace had a 1963 price tag of £47 5S. It's a pretty nice playing guitar with some lovely sounds - check out the videos on this page, and in the Vintage Guitar and Bass supporting members area
The Vox New Escort was Vox's version of the Fender Telecaster, at a time when American guitars were out of reach for most British musicians. It was made by JMI in England, for the British market, and unlike the majority of other models, didn't have an Italian-made equivalent. But the New Escort wasn't a slavish Fender copy, adding Vox's stylish teardrop headstock to the tele-style body, with a stop tailpiece and two Vox V2 single coil pickups. And it's a pretty substantial, and nice playing guitar, with a very comfortable neck. Check out the images, specifications, and watch a video of it in action. There is also extra content in the vintageguitarandbass supporting members area.
Catalog scan. The 1969 Fender Lovin' Care catalog consisted of 48 pages of electric guitars, basses, amplifiers, steel guitars, acoustic guitars, banjos and keyboards. Like the previous catalog, this featured the company's guitars in a variety of interesting settings around California, from the Whiskey-A-Go-Go, to the Hollywood Bowl. Several instruments were making their first appearance amongst it's pages: the Telecaster bass, Montego and LTD jazz guitars, and the Redondo acoustic. It was the final catalog appearance, however, of the Electric XII, Bass V, Duo-Sonic, Coronado I and Coronado Bass I.
The Eko Ranger series of guitars was incredibly popular in the second half of the 1960s and through the 1970s, selling in very large numbers. The Ranger Folk was 1 1/4" smaller, and 1" shallower than the Ranger VI and XII - and with a narrower waist. Not a bad guitar; a little quiet, but pretty playable. These were great value in 1973, and because they sold so many, they are easy to find and excellent value today.
The Symphonic bass was built in the UK, by Vox parent company JMI. It was the Vox equivalent to the Fender Precision bass, and was one of the most expensive Vox guitars produced. It was actually a great playing bass, rather similar to the Precision in feel and sound, but was probably just too expensive compared to an actual Fender and consequently sold poorly. When Vox hit financial problems in 1968, unsold guitars and basses were passed on to Dallas Arbiter, who briefly sold the excess Symphonic bass stock as model 4537. This bass, although with a neck date of February 1966, was most likely one of the unsold Vox guitars sold on by Dallas Arbiter. Check out the bass, and the two video demos through 1960s Ampeg and WEM amplifiers.
The 1968 Shaftesbury 'Electric Guitars' catalog was just four pages long, and contained four guitar models: the six string Barney Kessel-style 3264; and three Rickenbacker-styled semi-acoustic models: the six-string 3261, the twelve string 3262 and the 3263 bass. Shaftesbury was the house-brand of major UK distributor Rose-Morris, and seems to have been launched as a response to the company's loss of it's distribution deal with Rickenbacker. The guitars were mid-priced, and built in (initially) Japan, and later Italy, by Eko
1970 Rose-Morris catalog, dated April 1970. It featured 6 electric guitars, 32 acoustic guitars, 3 basses and 1 steel guitar. It contains the following instruments, over 20 pages: Electric guitars: Shaftesbury 3261, 3262, 3264, 3265, 3400; Top Twenty 1970; Bass: Shaftesbury 3263, 3266; Top Twenty 1971; Acoustic guitars: Eko Rio Bravo, Rio Bravo 12, Ranchero, Ranchero 12, Colorado, Ranger, Ranger Folk, Ranger 12; Aria 1674, 1675, 1676, 1679, 1680, 1695, 'John Pearse' Jumbo, 'John Pearse' Folk; Rose-Morris 15-11, Kansas, Georgian, Florida; Suzuki 1663, 1664, 1665, 3054, 3055, 3060; Tatay 1713, 1714, 1715; Peerless 3052; Steel guitar: Aria 3425
The sixteen-page 1971 Rose-Morris catalog featured electric guitars by Rose-Morris' own brand, Shaftesbury, and budget brand Top Twenty; aswell as acoustics by Eko, Aria, and for the first time Ovation. The catalog contains the following instruments: Electric guitars: Shaftesbury 3261, 3264, 3265, 3400, 3402; Top Twenty 1970; Bass: Shaftesbury 3263, 3266; Top Twenty 1971; Acoustic guitars: Ovation: Balladeer, 12 String, Glen Campbell, Glen Campbell 12 string; Eko Rio Bravo, Rio Bravo 12, Ranger, Ranger Folk, Ranger 12, Colorado, Ranchero, Ranchero 12, Studio 'L'; Rose-Morris Florida; Aria 'John Pearse' Jumbo, 'John Pearse' Folk
A detailed look at an early 1970s Fender Precision bass guitar in custom black finish, with rosewood fretboard. 1972 list price, $307.50. The Fender Precision had been shipping since at least very early 1952 - with just one re-design circa 1957. This example, then, shows a model already two decades old, but barely changed since the '57 revamp. Fender got it right first time around, and although there are numerous minor cosmetic differences, the essence of this bass is effectively the same as it was in '52: a simple, single pickup instrument with a GREAT sound. Check out the demo video through an old Ampeg B15. It's no wonder this is the bass that everybody wants!
The Vox Stroller was the brand's entry level electric solid body guitar, fitted with just one pickup and a fixed tailpiece. Although aimed at student guitarists, it wasn't a terrible instrument, but did lack somewhat in adjustability, having no accessible truss rod and only a floating rosewood bridge. But this example is actually quite an improvement on earlier versions, with a standard 1/4" jack and a solid mahogany body. 1967 price £18 2s. JMI ceased UK guitar production in late '67, and combined with decreasing demand for the Stroller, this surely must be one of the last examples shipped.
A nice example of the Vox Clubman II bass, built by JMI in Dartford, Kent in 1963. This is a lightweight bass, short (30") scale and very easy to play. It is an early example, and as such has a thin black scratchplate and side mounted, coaxial output jack. JMI offered left handed examples of their solid body Vox guitars and basses at 10% premium. Production numbers are unclear, but left-handed examples rarely come up for sale
Not to be confused with the Gibson ES Artist launched by Gibson in 1979; this ES Artist was an early model designed by the Gibson research and development team in Kalamazoo in 1977, the instruments themselves constructed by Gibson artist Chuck Burge. It was planned for launch as a high end semi acoustic with 335-style construction (central maple block) and innovative circuitry - but was pulled at the last minute, being deemed too expensive. Apparently, several examples were produced with varying specifications, though exactly how many actually left the Kalamazoo plant is unclear. Certainly two guitars were sold to LaVonne Music by Gibson in around 1980. Read more about the development of this guitar, with details from Chuck Burge and the story of it's sale to LaVonne music
The Hofner Committee was a truly beautiful guitar produced in Germany, primarily for the UK market. It was a large bodied (initially 17 1/2") guitar with a carved spruce top, available as an acoustic or electric guitar. By the early sixties the carved top was replaced with a laminate, and although still a very fine guitar, the earlier carved top examples, with frondose headstock (like the example shown here) are far more highly prized amongst musicians and vintage guitar collectors.
The Gretsch Chet Atkins Tennessean, or model 6119 was Gretsch's best selling hollow body of the 1960s. This wonderfully faded example from 1965 was originally Dark Cherry Red, but has turned a mid-orange brown. The original color, however, can be seen underneath the pickup surrounds. 1965 specs: maple body, two-piece neck, Brazilian rosewood fretboard and Hi-Lo 'Tron single coil pickups. Nickel plated Gretsch Bigsby tailpiece.
The 1965 Gretsch catalog, or catalog #32, featured 10 hollow body electric guitars, including the newly launched Gretsch Viking; four solid body electrics, including the Astro Jet - making it's only catalog appearance; just one bass, the single pickup PX6070; nine acoustics and 12 tube amplifiers. Pride of place went to the Chet Atkins Country Gentleman that adorned both the front and back covers. 24 pages, six of which are in full color.
Loose frets are especially problematic in certain old guitars, but are generally very easy to fix. You'll be amazed at the difference you can make with just a few tools, a bit of knowledge, and a little time. Fixing loose frets can eliminate fret buzz, remove sharp fret ends, and greatly improve the tone of any guitar. If your luthier bill will be greater than the value of your guitar, definitely time to have a go yourself!
Hagstrom guitars were distributed in the mid-1960s United States by Merson of USA. This eight page 'worlds fastest playing neck' catalog, printed in two-colors contained six solid body electrics, three solid body basses, two electric acoustic guitars, two electric acoustic basses and five acoustics.
The President was produced by Hofner in Bubenreuth, Germany, specifically for Selmer, who distributed the brand in the United Kingdom, Australia, New Zealand, South Africa, and other commonwealth nations. The President was a hollow body electric acoustic, available as a full body or thinline, and with blonde or brunette finish. It was a great playing guitar that sold fairly well in the second half of the 1950s, throughout the 1960s, and into the very early 1970s. The example shown here is a full-body depth guitar in blonde - and as a 1965 guitar, one of the last to feature the rounded Venetian cutaway. From late 1965 until 1972, the President sported a sharp Florentine cut. Naturally, such an electric acoustic suggests jazz and blues, but many of the original British Hofner President players were part of the rock 'n roll, skiffle and beat scenes of the late 50s and early 60s.
"The Choice of Professional and Student Musicians Everywhere" This eight page catalogue was included as an insert in the 1963 annual "school music" issue of Downbeat magazine (September 1963). As well as keyboards and pedal steels, this catalog contains seven guitars, three basses and ten amplifiers - from student guitars such as the Musicmaster and Duotone to professional models like the new Jaguar.
