.44-40. 7.4" barrel length. SN: 31. Nickel plated finish with walnut two piece grips and mounting a lanyard loop to the butt of the rear gripstrap. The bottom of the frame shows the manufacturer marking JB/3 within a circle, followed by the serial number 31. Further markings include faint three line patent dates on the left frame followed by 44 CAL caliber marking. The barrel serial number matches the revolver, but the top of the barrel shows the remnants of a Colt marking reading CO. HARTFORD CT. U.S.A.