The Yamaha SG-12 introduced in 1966, was one of Yamaha's first solid body electrics. Released alongside the SG-12 were the six string SG-2 and SG-3 versions. The SG-12 shares the same complex control circuits as the SG-3 appear rather complicated at first - according to SG-3 owner Gavin Wilson of the guitarz blog the SG-12 has two circuits (rhythm and lead) so you can set up two different tones on the guitar and switch between them,.

The Yamaha SG-12A was introduced around 1967 as the 12-string version of the SG-5A.

The Yamaha SG-2 introduced in 1966, was one of Yamaha's first solid body electrics. Released alongside the SG-2 was the three pickup SG-3 version as well as the shorter scale 12-string SG-12. The SG-2 (AKA model S301 in Japan) has two single coil pickups.

The Yamaha SG-2A was introduced in November 1967 and discontinued in 1971. The SG-2A has a peculiar asymmetrical body with an elongated horn on the treble side and a hockey stick style headstock. This is the 2 pickup version of the SG-5A, and it has one less control knob.

The Yamaha SG-3 introduced in 1966, was one of Yamaha's first solid body electrics. Released alongside the SG-3 was the two pickup SG-2 version as well as the shorter scale 12-string SG-12. The SG-3 (AKA model S302 in Japan) has three single coil pickups, although two are close together at the bridge to allow humbucking.

The unusual shape of the Yamaha SG-3C has been described as an eggplant, an earlobe or even a flying banana. It was part of a small group of original designs introduced by Yamaha in 1968, these included the Yamaha SG-5.

The SG-3C has a bolt-on maple neck, rosewood fingerboard and samurai sword type headstock finished to match the body. The machine heads were open geared types, and chrome plated. It had 22 frets, plus a zero fret - with an overall scale length of 630 mm. It weighed 3.4 kg.

The Yamaha SG-5A was introduced in 1966 and discontinued in 1971. The SG-5A has a peculiar asymmetrical body with an elongated horn on the treble side and a hockey stick style headstock, the guitar was designed with the input of Japanese Eleki legend Takeshi Terauchi.This 6-string Yamaha electric guitar has 22 frets, Coro tremolo type tailpiece, knobs and tuners. The SG-5A had three single coil pickups, two close together at the bridge and a slanted one at the neck. The SG-5A was reissued in 2000 as the SGV300

The Yamaha SG-7A was introduced in 1966 (as the SG-7 model) and discontinued in 1971. The SG-7A has a peculiar asymmetrical body with an elongated horn on the treble side and a hockey stick style headstock, the guitar was designed with the input of Japanese Eleki legend Takeshi Terauchi.This 6-string Yamaha electric guitar has 22 frets, Gold plated Coro tremolo type tailpiece, knobs and tuners. The SG-7A had three single coil pickups, two close together at the bridge and a slanted one at the neck.