Massachusetts Arms Co., Wesson & Leavitt Patent .40 Caliber Dragoon Revolver, Serial No. 224, circa 1852. Blued round barrel with fore-sight, top-strap marked MASS. ARMS CO. / CHICOPEE FALLS, 6-shot .40 caliber cylinder, lock-plate marked WESSON'S & LEAVITT'S PATENT, case-hardened breech, lock-plate, top-strap and hammer, blued cylinder, cylinder arbor latch (marked PATENT NOV. 26. 1850) and back-strap, brass trigger-guard, brass collection tag marked 245, oil-finished walnut grips.