Yamaha started its official line of solidbody electrics in 1966. Of these early models, the most recognizable is probably the Flying Samurai series.
The Flying Samurais were designed by Japanese surf rock legend and Mosrite fan Takeshi Terauchi. Zero fret, reverse asymatrical body shape, this love is all over the flying samurais.
The SG-5 was released in 1966 and the SG-5A the year after. Yamaha had the habit of adding the letter “A” to the name of improved models. Hear it