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. distributor is now Six String Brokerage LLC, Nazareth, Pa. They are 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. In 2011 the German company 'AMI Musical Instruments GmbH' purchased the rights to the name and relaunched Sigma Guitars again, this time being produced in China. Jump to navigationJump to search 1980 Sigma D-10 Anniversary Guitar
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