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The early 70s models (1970 -1975) 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 sigma symbol is often described as a "sideways M."Sigma's made in Japan from 1970 through 1979 used a paper label to identify the model and serial number of the instrument.Construction moved from Japan (1970–83), to Korea (1984-93/94), and finally Taiwan (1993–2007).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.

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.

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