Since the U.S. Rights to the Sigma brand name and trademark had been allowed to lapse by C.F.
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.