Only around 1,000 of the Wesson & Leavitt Belt Model revolvers were manufactured by the Mass. Arms Co. in 1850 and 1851 before legal action by Samuel Colt halted production. In addition to the standard markings and cylinder etching, this revolver has higher quality engraving and gold trigger guard, grip washer, and back strap whereas silver plating on the latter components was standard. The back of the barrel "barb" and face of the arbor pin are marked "58," and the inside of the lock, underside of the back strap, front of the grip, and left side rear of the frame have "623." The grip has some nice figure. It comes in a hardwood case containing a Mass. Arms Co. bullet mold and powder flask as well as several lead balls.