![]() ![]() ![]() ![]() Sigma guitars made in Japan from 1970 through 1983. The DM-5 and DR-7, as well as other early models continued to be built during this time as well. In 1980, 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. D for dreadnought, R for rosewood, M for mahogany and the number denoting the grade of wood, 5, 7, 9, 11, 15.Ĭonstruction moved from Japan (1970–83), to Korea (1984-93/94), and finally Taiwan (1993–2007). Dreadnought models DM-5 and DR-7 are the most common early Sigma guitars until the late '70's. 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. ![]()
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