.22 LR. 6" barrel length. SN: 644603. Blued metal finish with casehardened hammer and trigger mounting diamond checkered walnut Smith & Wesson medallion grips. Double action hand ejector six-shot revolver featuring a round barrel and smooth topstrap. Item mounts adjustable target rear notch and pinned Patridge front blade sights on a five screw frame with pinned barrel and a recessed cylinder. Rear sight fits proud of the topstrap indicating replacement. Left frame is struck with Smith & Wesson's monogram trade mark with the right frame marked MADE IN U.S.A. Barrel flanks show standard caliber and manufacturer marking with the top showing two-line address and patent marking reading SMITH & WESSON SPRINGFIELD MASS. U.S.A./PATENTED FEB. 6. 06. SEPT. 14. 09. DEC. 29. 14. Rear surface of the hammer is also marked REG. U.S. PAT OFF.