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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.1970" underneath in a smaller block font, in the familiar Martin headstock decal form. re: My own first Sigma, a DM12-5, which I purchased new in mid-1977 (I still have the receipt) had this second gen "Martin style" decal logo.We base our price estimates on real world transactions and record them in our entries so you can see what your instrument has sold for in the past. History Initial construction was in Japan by various manufacturers/factories from 1970 through 1983. (The Model number is not necessary to find the date of manufacture.) On round hole martin guitars, the serial and model numbers are stamped on the neck block inside the instrument. First locate the Serial number on your Martin® guitar.It being a smaller, local store, the instrument may have been sitting there for a while before I acquired it.While I cannot be absolutely certain of the year it was manufactured, it was certainly by, or prior to 1977.
The DM-5 and DR-7, as well as other early models continued to be built during this time as well.The first Sigmas were typically dreadnought acoustics, although Grand Concert Series (GCS) and classical models were also produced from the early 1970s (1971) onward.Dreadnought models DM-5 and DR-7 are the most common early Sigma guitars until the late '70's.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 902,908.75XXXXXX 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.