Guitar maker C.F. 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. The result was Sigma Guitars.
The Sigma line was discontinued by C.F. Martin & Co. in 2007.
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.
Since the U.S. rights to the Sigma brand name and trademark had been allowed to lapse by C.F. Martin & Co. prior to selling the brand to AMI, and had since been picked up by St. Louis Music of Missouri, AMI is not allowed to use the brand name "Sigma" in the U.S. for their current line of guitars. They are distributed and sold in the U.S. as Kindred Guitars. The sole current U.S. distributor is now Six String Brokerage LLC, Nazareth, Pa.
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