Style 51 Martin baritone uke, circa 1960 (when they were introduced). Martin USA-made ukes do not have serial numbers. Mahogany body and neck. Rosewood fingerboard and bridge. 14 fret neck, 20" scale. Tuned DGBE. All original, nice faux tortoise shell binding. No cracks, very few nicks - very good condition. Includes hard foam case.