Only 400-500 of these pistols are estimated to have been manufactured between late 1854 and the summer of 1855 at the Fairmount Rifle Works before production shifted to the large frame version. The left side of the frame is marked "SHARPS PATENT/ARMS MFED./FAIR MOUNT/PHILA. PA." A brass post/blade is used as the front sight, and a groove in the frame at the breech serves as the rear sight. Matching serial numbers are found on the lever, breechblock, left side of the grip frame, and inside of the grips (latter only partially visible due to inletting/shaping).