I have an old vintage guitar with a MOUNTAIN paper label and MOUNTAIN on the back of the headstock. It was made in Japan and probably from the 60's or 70's. It has the headstock and the inlay of an old Martin guitar. The top is solid spruce the back is laminated rosewood. OM sized instrument. Vine inlay on the rosewood fingerboard. I heard these were made with Martin parts. I would love to get more information about this instrument.