Only around 1,000 of these revolvers were manufactured between 1850-1851 before production was halted due to a patent infringement suit won by Samuel Colt. 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 Massachusetts Arms Co. "MASS. ARMS CO./CHICOPEE FALLS" is marked on the top strap. "WESSON'S & LEAVITT'S PATENT" is marked on the lock. "LEAVITTS PATENT APRIL 29. 1837" is on the back of the cylinder, and "WESSON'S PATENT AUG. 28. 1849" is on the bevel gear. "144" is marked on the recoil shield and underside of the top strap, and "488" is on the back of the barrel lug.