I have an S.Yairi as well – a model 700 which I assume from the other posts is the bottom of the range. It was manufactured in 1975 and I bought it as second owner in 1976 in Australia for about $200 when I started getting serious about learning classical guitar. It has always been a geat guitar – solid spruce top, bookmatched two piece back. The only information I have been able to find on S.Yairi guitars is in this discussion and has been very helpful in that after 25 years I have decided to trade in my rarely played Yairi for a new Maton steel string that will get a lot of use. I have no idea what it is worth but am getting a trade in valuation done today at the local music store. This info will help attest to the quality of the guitar which is fairly obvious when played anyway and also confirm its rarity.