Gibson Kluson Gold plated "closed back" PAT. APPLD. 2356766 TREBLE SIDE tuner for Gibson guitars 1947-1952. These tuners are distinguished by the "closed shell," i.e. button shaft does not protrude on the opposite side, the PAT. APPLD. on the base plate, and also on the back side of the clam shell. Some wear and patina but still functions fine with straight shafts. See other listing for more from this set.