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The "First Generation" DM-5 and DR-7 (laminate wood bodies and tops,) as well as other early models (e.g. They are called 'Second Generation' Sigma's by C.F. In 1978, 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. distributor is now Six String Brokerage LLC, Nazareth, Pa.Ĭonstruction moved from Japan from 1970–1983, to Korea from 1984-1994, to Taiwan in 1994 (made in both Korea and Taiwan for the 1994 model year) and finally Indonesia (?–2007). 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. Additional Models Approximately 1975 to 1978.Basic Characteristics of Made in Japan Sigma Guitars.Martin & Co., based in Nazareth, Pennsylvania, created a line of inexpensive guitars in 1970 to compete with the increasing number of imported guitars from Japan and elsewhere.