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SIGMA GUITAR SERIAL NUMBER CHECKER SERIAL NUMBERS
The model and serial numbers were usually stamped on in ink, but some are known to have been hand-penned. Sigma Guitars S Serial Numbers Were Usually The headstock shape was also modified to a deeper taper and shaped to resemble the Martin instruments. On right-handed models while playing a Sigma guitar the sideways M becomes right side up suggesting M for Martin. The current logo under AMI consists of a single word in block lettering Sigma surmounted with the symbol (the Greek letter sigma ).
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The original brand logo resembled the C.F. The early 70s models (197075) can be distinguished by a more squared peghead, shaped similarly to that of a spatula. The First Generation DM-5 and DR-7 (laminate wood bodies and tops,) as well as other early models (e.g., the GCS-7CS-7) remained in production during this time as well. They are called Second Generation Sigmas by C.F. Though other models were produced the most common two throughout the 70s were the Dreadnought models DM-5 (DM12-5) and DR-7 (DR12-7.) D for dreadnought, R for rosewood, M for mahogany and the number denoting the grade of wood, 5, 7, 9, 11, 15. Sigma released a wide series of acoustic and classical guitars, which initial construction was in Japan by various manufacturersfactories from 1970 through 1983. They are distributed and sold in the U.S. Sigma Guitars S Serial Numbers Were Usually.