I've had this very nice classical for about 20 years now, and still enjoy it very much. In researching Matsuoka guitars thru the net, I've found no mention of the M12 model - is it an early production run, or possibly an entry level instrument? The serial number, stamped on the neck base within the guitar, starts with 83, which leads me to believe produced in that year. Mine appears to have a matte-finished solid cedar top (color, dents easily), sounds sweeter and less loud the spruce-top Sigma CR-9, and has better action. If anyone has any further information, it'd be much appreciated.