Hello All

I have a Yamaha S-50 nylon string with Nippon Gakki Co Ltd on the inner label & an obscure 9202 printed in the top corner. I believe it to be nylon based on the design of the tuning pegs and bridge but the strings have been changed a hundred times so it’s hard to tell. I know the person who bought it new in 1968. Good condition.
I can’t find any information on this guitar. The closest is a 50A. Is anyone familiar with this and able to offer value on background and/or value. I’m guessing it is one of the earlier Yamahas based on the history of the company..?
Thanks!