The headstock shape was also modified to a deeper taper and shaped to resemble the Martin instruments. 1970' underneath in a smaller block font. By the mid 1970's (c1976) the headstock logo design changed to a gold 'Martin style' decal that said, 'Sigma Guitars' in script with 'Est. On right-handed models while playing a Sigma guitar the 'sideways M' becomes 'right side up' suggesting 'M' for Martin. The sigma symbol is often described as a 'sideways M.' While retaining the same early logo for several more years (c1975/76) the peghead itself began to take on a more tapered shape by 1972. The early 70s models (1970 -1975) can be distinguished by a more squared peghead, shaped similarly to that of a 'spatula.' The logo consisting of a gold decal with the single word in block lettering SIGMA surmounted with the Σ symbol (the Greek letter sigma), in mother of pearl. Sigma guitars made in Japan from 1970 through 1983.
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