Metal capped plastic 'bell' control knobs. Height 18mm. Lower diameter 24mm, upper diameter 14mm. To fit a 6mm potentiometer shaft. Numbered 0 - 10. These control knobs were fitted to almost all electric guitars produced at the Matsumoku guitar factory, Matsumoto Japan from the mid/late 1960s to the mid 1970s. All were painted from the inside, with an (approx) 7mm clear section, and a gold metal reflector cap marked V (volume) or T (tone). It seems these knobs were solely used by Matsumoku, and are a very good indication of a Matsumoku-made guitar. Three colours exist: gold and silver (with black numbering) and black (with white numbering). Although some guitars always had the same knobs (Epiphone guitars were pretty much always fitted with the silver variant, and the various Les Paul copies with gold hardware were fitted with gold knobs), others could be shipped with any of the colours, seemingly at random.
The Matsumoku facility produced guitars for export around the world, and these knobs appeared on guitars branded: Angelica, Aria, Aria Diamond, Commodore, Conqueror, Conrad, Dorado, Domino, Electra, Epiphone, Eros, Jedson, Kimbara, Kasuga, Lyle, Lyra, Madeira, Maxitone, Orlando, Pan, Raven, Shaftesbury, Stewart, Univox, Ventura - and most likely many, many more.
List of Matsumoku control knobs
Silver metal-capped bell knobs, fitted to a 1971 Epiphone 1820 (ET-280) bass. Silver knobs were used on many guitars, but were the colour of choice for most (maybe all) Matsumoku-built Epiphones between 1970 and 1975.
Black metal-capped bell knobs, fitted to a 1971 Commodore N25 semi-acoustic.
As can be seen here, the lower portion of the knob is coloured (painted from the underside), with a clear top which holds the metal cap.
Gold metal-capped bell knobs, fitted to a 1971 Shaftesbury 3400 solid body.
The gold knobs have black lettering, and a gold cap.
The silver knobs have black lettering, also with a gold cap.
The black knobs have white lettering, still with a gold cap.
The body of each knob is made of clear plastic and is painted from the underside.
$35
$75