I was wondering about the model scheme. I have come across the M designated models but the one I have is a No. 60 (from 1980). I have read elsewhere that these were higher end guitars but I can't find much info on them. Does anyone know??During the 1980s and early 1990s, Matsuoka models included the M50, M60, M70, M80, M100, M150, M200, and M300 with Ramirez style headstock and models MH100, MH150, MH200, MH300 with Hauzer style headstock. All of them were made with solid Spruce tops. M50, M60, M70 were made either with laminated back and sides or as all solid guitars. All other models were all solid wood guitars.