I have a Terada classical guitar quite similar to yours except the model number is G330. When I bought it in 1974 I was told it's a copy of the Ramirez 1a but with 650 scale, cedar top, orange lacquer and carved head. The sound is nothing compared to the Ramirez 1a but it has a very pleasant tone and very easy to play. As for price of yours, I wouldn't expect more than US $100.00 in such condition.
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"Nothing is more beautiful than a guitar, save perhaps two.”