Marked Mass Arms Co. Chicopee Falls, British Crown cypher.
This lock is for the British Greene Carbine contract, made by Mass. Arms Co. Chicopee Falls, Mass, produced from 1855- 1857. 2000 of these were contracted for, and have the VR Cypher for Queen Victoria. The lock incorporated the Maynard Tape Priming System.
A functioning lock still retaining some case colors on the outside of the lock, and strong blue finish on internal parts. There is some light peppering of pits on the primer door and latch, otherwise smooth surface elsewhere.
A nice example if you need to upgrade.