Yes, I found a vintage Yamaha GC30B model but was sold for JPY 250,000 or about US $2,300. The appearance of the sound board looked like Spruce top.
The brief description read as follow:
Yamaha GC - 30B (Ezaki Hideyuki) Matsu / Hakaranda It is second hand goods in 1882.
It is thought that the surface board is shellac painting and the side back is lacquer painting.
The neck is a mahogany Spanish style single rod.
It is a bit shorter with a chord length of 656 mm, looking at the back plate etc., it is exactly the Aguado model.
The thread winding has been changed to GOTO 's 40G - 1600.
It is with a hard case.
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Last edited by lawcch on Wed Aug 02, 2017 10:35 am, edited 1 time in total.