MARTIN GUITAR SERIAL NUMBERS VALUE SERIES

1970' underneath in a smaller block font. By the mid 1970's (c1976) the headstock logo design changed to utilize a gold 'Martin style' decal stating 'Sigma Guitars' in script with 'Est.

Interestingly, 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.'

The early 70s models (1970 -1975) can be distinguished by a headstock logo consisting of the single word SIGMA surmounted with the ОЈ symbol (the Greek letter sigma), in mother of pearl. Sigma guitars made in Japan from 1970 through 1983. The DM-5 and DR-7, as well as other early models continued to be built during this time as well. 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. D for dreadnought, R for rosewood, M for mahogany and the number denoting the grade of wood, 5, 7, 9, 11, 15.Д¬onstruction moved from Japan (1970вЂ“83), to Korea (1984-93/94), and finally Taiwan (1993вЂ“2007). Dreadnought models DM-5 and DR-7 are the most common early Sigma guitars until the late '70's.

MARTIN GUITAR SERIAL NUMBERS VALUE SERIES

The first Sigmas were typically dreadnought acoustics, although Grand Concert Series (GCS) and classical models were also produced from the early 1970s (1971) onward. Initial construction was in Japan by various manufacturers/factories from 1970 through 1983.

Martin guitar serial numbers value