I just bought a Sigma of Martin and Company Made in Japan. Serial # 8182. Model Dr-12-7 with what I believe to be the original hard case. This guitar has the paper sticker inside and the Sigma name on the head is not like the others It just says sigma in bold lettering with a mother of pearl, sideways (M) obove it?
It plays awesome and has sustain for days and seems to be in good to very good condition.
Does any one know what it could be worth?