Only around 1,000 of these revolvers were manufactured in 1850 and 1851 before production was halted due to a patent infringement suit won by Colt. These are basically a scaled down version of the Wesson & Leavitt Dragoons of the same period. The design was in part by Edwin Wesson, older brother of Daniel B. Wesson of later Smith & Wesson fame. The younger Wesson and Horace Smith were among the incorporators of the Mass. Arms Co. The revolver has scroll engraving on the lock and frame, etched floral and martial patterns on the six shot cylinders, "MASS. ARMS CO./CHICOPEE FALLS" on the top strap, "WESSON'S & LEAVITTS PATENT" on the lock, "LEAVITTS' PATENT APRIL. 1837" on the back of the cylinder, "WESSON'S PATENT AUG. 28. 1849" on the bevel gear, "313" on the front of the cylinder arbor pin and back of the barrel barb, and "152" on the recoil shield and lock mortise of the grip.