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Later first and second generation Sigma guitars were clearly made of laminate wood for the back and sides, with the exception of several Limited Edition models, such as the D-10 Anniversary guitar.
Other Sigma instruments included mandolins, banjos, acoustic and electric basses and solid body and hollow body electric guitars.
This is understandable since the Martin customer service department now responds to individual inquiries stating "all" Sigma's had laminate back/sides with solid tops, while Sigma catalogs from the early 70s list the back/side wood as solid.
To complicate matters further, in the 70's Sigma produced a line of guitars clearly identified by Martin, at that time, as having laminate backs and sides: model numbers starting with 52S, e.g., 52SDM-5, 52SDR-7 and 52SGCS-7.
I bought it new in 1970." Further, DR-7's with a four digit ink stamped label serial number and a zero fret strongly suggests a very early build date.
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.
History Initial construction was in Japan by various manufacturers/factories from 1970 through 1983.
One Sigma DR-7 owner stated "I have an old Sigma DR-7 Guitar....s/n 6860.Some solid body electric guitars were made by Tokai Guitars Company, LTD.After Sigma musical instruments were built in Japan, Korea, and Taiwan, they were sent to Martin & Co.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.
in Nazareth, Pennsylvania to be inspected and adjusted by Martin personnel before going to an authorized retail store for sale to the public.