L-R as seen through the sound hole: Serial number, 'Brand,' Model number.) The serial numbers on these instruments were often preceded by the letters S or E e.g. Being a mid-year change, some continued on with the 'Purple' label, though with the new serial number designation preceded by an 'S' or an 'E' This is prefixed by the serial number assigned to the instrument and followed by an ink stamp of the model number. The Back Brace Brand: From 1978 through 1983 1978 being a transition year, one might find the center back brace is pressure stamped, or 'branded' in a football shape stating Sigma Guitars/Made in Japan/For/C.F. All other text was printed in black ink, or stamped on in ink by the manufacturer (model and serial numbers.) 5-digit, or 8-digit serial numbers. The Σ symbol now also in this same pink/purple color. The 'Purple' label (c1972 onward): These are again white labels that had gold & black lettering but this time with a border, often pinkish-brown or violet in color. More about the 8-digit serial numbers later. These will have a 4, 5 or 8 digit (7*0XXXXX) serial number stamped or hand written on them. The 'Gold' label: The next generation of labels are transition labels that are white w/Sigma and three horizontal lines in gold ink, the Greek sigma in black and printed black text (Made for C.F. This is especially true of unusual, special (sample/prototype models) and/or low production number models (e.g.: DT-30.) The 'Black and White' label: The earliest examples had a plain black on white inner paper label showing the model and serial numbers. The model and serial numbers were usually stamped on in ink, but some are known to have been hand-penned. Sigma's made in Japan from 1970 through 1979 used a paper label to identify the model and serial number of the instrument. As is traditional with classical instruments, Sigma classical guitars do not have the headstock logo, and one must rely on the inner label for identification. The headstock shape was also modified to a deeper taper and shaped to resemble the Martin instruments. 1970' underneath in a smaller block font. By the mid 1970's (c1976) the headstock logo design changed to a gold 'Martin style' decal that said, 'Sigma Guitars' in script with 'Est. On right-handed models while playing a Sigma guitar the 'sideways M' becomes 'right side up' suggesting 'M' for Martin. The sigma symbol is often described as a 'sideways M.' While retaining the same early logo for several more years (c1975/76) the peghead itself began to take on a more tapered shape by 1972.
The early 70s models (1970 -1975) can be distinguished by a more squared peghead, shaped similarly to that of a 'spatula.' The logo consisting of a gold decal with the single word in block lettering SIGMA surmounted with the Σ symbol (the Greek letter sigma), in mother of pearl. Sigma guitars made in Japan from 1970 through 1983. The 'First Generation' DM-5 and DR-7 (laminate wood bodies and tops,) as well as other early models (e.g., the GCS-7/CS-7) remained in production during this time as well. They are called 'Second Generation' Sigma's by C.F. In 1978, model designations were added to capitalize on Martin model numbers: the DM-18, DM-19, DR-28, DR-28H, DR-35, DR-41, and DR-45. Ĭonstruction moved from Japan from 1970–1983, to Korea from 1984-1994, to Taiwan in 1994 (made in both Korea and Taiwan for the 1994 model year) and finally Indonesia (?–2007). Though other models were produced the most common two throughout the '70's 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.
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The first Sigmas were typically dreadnought acoustics, although Grand Concert Series (GCS) and classical models were also produced from the early 1970s (1971?) onward. Initial construction was in Japan by various manufacturers/factories from 1970 through 1983. distributor is now Six String Brokerage LLC, Nazareth, Pa. They are distributed and sold in the U.S.
Louis Music of Missouri, AMI is not allowed to use the brand name 'Sigma' in the U.S. prior to selling the brand to AMI, and had since been picked up by St. rights to the Sigma brand name and trademark had been allowed to lapse by C.F. In 2011 the German company 'AMI Musical Instruments GmbH' purchased the rights to the name and relaunched Sigma Guitars again, this time being produced in China. Jump to navigationJump to search 1980 Sigma D-10 Anniversary Guitar
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