6/1/2023 0 Comments Dating sigma guitars![]() "Sigma Serial Numbers do not provide an indicator of the year in which a particular model was built. Made in Japan Sigma's (1970 through the late '70s) had an inner paper label giving model and serial numbers. Sigma classical guitars do not have the headstock logo, and one must rely on the inner label for identification. The sigma symbol is often described as a "sideways M." Interestingly, while playing a Sigma guitar the "sideways M" becomes "right side up" suggesting "M" for Martin. ![]() Sigma guitars made in Japan from 1970 through 1979 can be distinguished by a headstock logo consisting of the single word SIGMA surmounted with the Σ symbol (the Greek letter sigma), in mother of pearl. The DM-5 and DR-7, as well as other early models continued to be built during this time as well. In 1980, model lines were added to capitalize on Martin model numbers: the DM-18, DM-19, DR-28, DR-28H, DR-35, DR-41, and DR-45. Dreadnought models DM-5 and DR-7 are the most common early Sigma guitars until the late '70s (D for dreadnought R for rosewood, M for mahogony and the number denoting the grade, 7 being the top grade instrument). The first Sigmas were typically dreadnought acoustics, although Grand Concert Series (GCS) and classical models were also produced from the early 1970's onward. ![]() Initial construction was in Japan from 1970 through 1984. 3.2 Additional Models Approximately 1975 to 1978.2 Basic Characteristics of Made in Japan Sigma Guitars.
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