The S-90 was launched sometime around 1972, at a price of $275. It had the new SG style body shape and twin humbuckers of the S-100 yet with the simplified controls and simpler hardware of the S-50. Gibson were continually refining the SG, and the 1972 prices ran from $249 for the single pickup SG-I, to $595 for the SG custom. The Guild S-90, with its mahogany body, set mahogany neck and full body scratchplate with twin humbuckers was reminiscent of the SG special and standard of 1968-70, yet in the price range of the cheapest Gibson two pickup sg, the SG-II at $279.50
The Guild S-90 electric guitar
It was also available in a wider range of colours: Sunburst, Cherry, Black, Walnut, or Natural.
The description below comes from the 1975 Guild electrics catalog
An electric that tells your friends you're moving up - because it's a Guild. The S-90 gives you the advantages of Double Humbucking Pick-Ups, besides the efficiency of high quality tuning machines, bridge, tailpiece and controls. Guild's neck and fingerboard will help you develop your style and skill.
Details: Contoured all mahogany solid body. Guild extra-fast, very thin mahogany neck with fully adjustable truss rod. Rosewood fingerboard with inlaid mother-of-pearl position dots. Natural headplate. All hardware chrome plated. Guild machines. Guild AdjustoMatic 6-way bridge. Tailpiece of solid brass. Laminated pickguard. 22 frets. Neck joins the body at 18th fret. Guild E-220 Sidebender Strings.
Electronics: 2 chrome plated Guild Humbucking Pick-Ups with individual adjustable pole pieces for each string and 3-way tilt adjustment for accurate pick-up placement. 3-position pick-up selector. Separate tone and volume controls.
Dimensions: Body 1 7/8" (32.7 cm.) wide, 16 1/2" (41.9 cm.) long, 1 5/16" (3.3 cm.) thin. Overall length 40" (101.6 cm.). Scale length 24 3/4" (62.8 cm.). Neck width at nut 5/8" (4.1 cm.).
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