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All other text was printed in black ink, or stamped on in ink by the manufacturer (model and serial numbers.)From 1980 through 1983, the end of Japanese production, the back center brace is pressure stamped, or "branded" in a football shape stating Sigma Guitars/Made in Japan/For/C. This may be due to them being built in several Japanese factories at the same time with no coordination in the serial numbering system.However, while some models lasted the entire run from 1970 through 1983, others did not and were only offered for a limited number of years, so that most models' construction dates can be narrowed down to a reasonable range.History Initial construction was in Japan by various manufacturers/factories from 1970 through 1983.The first Sigmas were typically dreadnought acoustics, although Grand Concert Series (GCS) and classical models were also produced from the early 1970s (1971) onward.In 1980 the paper labels were discontinued and the inner back brace was "branded." With the move of production to Korea in 1984, paper labels, this time with a fancy border, were reinstated, although some early 1984 models still retained the back center brace stamping.Sigma identified their dreadnought and grand concert guitars as "Second Generation" when the headstock design changed to utilize a gold decal stating "Sigma Guitars" in script with "Est.75XXXXXX possibly equates to a build year 1975.) It is widely assumed by owners and Sigma historians that this is correct, though C. These instruments were constructed using preformed and sometimes partially assembled imported parts, built or completed in the C. Martin factory in Nazareth, Pa alongside the regular production line Serial numbers for Sigma guitars built in Korea and Taiwan are perhaps meaningless, though again some seem to indicate the year of manufacture (e.g.81XXXXXX.) Since we know these instruments were manufactured from 1984 through 2007 in these two countries, it is safe to assume that a serial number beginning with 81XXXXXX was not produced in 1981.
Some early 70s Sigma guitar serial numbers started with 7* suggesting the 197* build date (e.g. "Sigma-Martin USA" guitars built in 19 had serial numbers 900,001 to 902,908.The DM-5 and DR-7, as well as other early models continued to be built during this time as well.