I love my tan label FG-75, made in Japan, 1974, which is my go-to. L-00 size, ladder braced blues box. I had a neck reset done and bone nut and saddle put in. It sounds better every year and was well worth the investment. However, many luthiers will not touch the old Yamahas due to the epoxy used to glue the neck...or dowels to hold in place.
I hope to get a Red Label Nippon Gakki FG110 or 150 and have the neck reset, in needed. Right now I have my eye on a FS5 red label reissue, but interestingly, the Chinese made Yamahas got better build quality reviews than the Japanese made guitars.
Also, the used guitar market is expected to be in full glut due to the growing post covid hang-over, so I will hold off for now. I don't think it is a risky buying site unseen today, since the large online retailers have no hassle returns and credit card protection. Out of the box, always check the neck angle and action.