Though other models were produced the most common two throughout the 1970s were the Dreadnought models DM-5 (DM12-5) and DR-7 (DR12-7.) D for dreadnought, R for rosewood, M for mahogany and the number denoting the grade of wood, 5, 7, 9, 11, 15. The first Sigmas were typically dreadnought acoustic, although Grand Concert Series (GCS) and classical models were also produced from the early 1970s (1971?) onward. Sigma released a wide series of acoustic and classical guitars, which initial construction was in Japan by various manufacturers/factories from 1970 through 1983. Martin created the brand Sigma in order to compete with cheaper guitars that were imported from Asia. The current range of Sigma instruments include acoustic and classical guitars, acoustic basses and ukuleles.Īmerican company C.F. They were distributed and sold in the U.S. Louis Music of Missouri, AMI is not allowed to use the brand name "Sigma" in the U.S. prior to selling the brand to AMI, and had since been picked up by St. rights to the Sigma brand name and trademark had been allowed to lapse by C.F. The rights to the name were acquired by German company AMI Musical Instruments GmbH, which relaunched the brand with guitars being produced in China. The Sigma line was discontinued by Martin in 2007. Martin as a line of guitars at affordable prices to compete with the increasing number of imported guitars from Japan and elsewhere. Sigma Guitars is a guitar manufacturing brand originally released by C.F. ( Learn how and when to remove this template message) ( September 2022) ( Learn how and when to remove this template message)
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