Less than 500 of these rifles are believed to have been manufactured c. 1855-1860, with less surviving today. These "faucet" mechanism rifles are easy to identify thanks to the massive square stud on the right side of the round action and the distinctive lever that rotates up allowing the rifle to be loaded through the breech. It has a large blade front sight, adjustable sporting notch rear sight with elevator, "ALLEN & WHEELOCK. CAST-STEEL 147/WORCESTER" on the upper left barrel flat, "ALLEN'S PATENT/JULY 3./1855." on the lever, nicely figured buttstock, rifle buttplate with trapdoor. Matching serial number "147" marked on the left of the frame breech, sight elevator, forearm and bottom of the barrel.