The GK-55 is basically a stripped-down model based on the '55 Les Paul. It is a flat-top 55 body style, dark sunburst, two "dirty fingers" humbuckers, no binding or inlays and a bolt on neck. These were made in the Gibson plant in Kalamazoo, MI between 1979 and 1980. Only 1000 were ever produced.. This guitar has had a repair to the headstock and has a metal plate over the join for strength, so its not gonna break again in a hurry.