Another rare SG-90, 1973 , autographed by Barney Kessel. Prior to the famous Yamaha SG-175 and Yamaha SG-2000, Yamaha Music Corporation produced a series of early Yamaha SG double cutaway prototypes. These were the Yamaha SG-30, 35, 50, 70. In 1974 the phenomenal and relatively successful SG-90 and SG-175 were released. Like these later models, the SG-90 is a light weight near top of the range, early SG with a phenomenal playability and versatile sound. This is a truly great electric guitar with a good solid feel, playing light and fluid and certainly has lots of mojo and a definite vintage vibe. The guitar has a solid body with a set neck, rosewood fret board with mother of pearl dot position markers and embossed serial number, Chrome Hardware and Tuning pegs.