Thank God that I now own 2 of the finest guitar Yamaha has ever produced.
I went with my good friend luthier Sen Goh to take a look at a 1974 one owner hardly played Yamaha GC30A. I came back very disappointed with the guitar. It had a very hollow bass and unattractive treble. This guitar is no where near my 1980 Yamaha GC30A and 2006 Yamaha GC70.
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1980 Yamaha GC30A - BRW/Spruce
1984 Yamaha GC70 - BRW/Spruce
2015 Sen #5 - BRW/Spruce
2017 LHN - BRW/Spruce