Mets des photos, en oubliant pas l'étiquette à l'intérieur. La valeur dépend de l'état et de l'année (les spécifications changeant selon l'année de fabrication).
Bien sûr, ça dépend aussi de comment la guitare sonne (chaque guitare étant unique).
L'idéal est de la montrer à un luthier.
Citation:
I went through this just about a month ago. I wanted a decent 12 string for under $500.00. After doing a lot of looking I came across a late 70's Yamaha FG 512 (first generation) on e-bay. I called Yamaha and asked them about this guitar (BTW they were very helpful) and their Ad department sent me a FAX several days later. I was very pleasantly surprised at about the woods, materials, bracing and general overall quality that was put into this guitar. At the very bottom ( currently the last comment) of the below listed link you can read what I found out about the FIRST GENERATION FG 512's:
http://217.160.250.165/forums/(...)62869
I've had the guitar for a few weeks now and have been extremely pleased with it, moreover it is absolutely beautiful to look at and I feel like that for once, I got a really, really good buy! If you're interested there is currently another one for sale on e-bay.
Be careful, as Yamaha is currently producing a FG 512 II, a second generation of this guitar, which is not of the same quality.
If you do a search for Yamaha Guitars you will come up with a link to their site which has specs on current production acoustic models. For some reason I can't seem to post that link here. May be its too long.
BTW I paid much less than the $500 I had budgeted.
http://www.acousticguitarforum(...)63211
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If you decide to go this path, Yamaha actions of the era were horrible; very high and difficult to play. If you are lucky enough to find one which has not been altered, you will be able to get it set up exactly as you like it. I can't comment on new-build Yamahas because I have not played one.