Looks like a '50s Gibson Tun-O-Matic with saddle retainer wire. Bridge saddles are lightly slotted in the center. TABR-1" cast into the bottom of the bridge. Bridge base appears to be fine grained fingerboard wood stained black. Bridge base measures 3.358" long, .470" deep. Mounting centers approx. 74mm (2.913"). Brand New. Genuine Gretsch 0060884000. UPC 717669207038.