This percussion lock was made by Thompson Center, for their Hawken, Renegade, New Englander, White Mountain Carbine, and Pennsylvania Hunter models. The photo is representative! This used lock is in perfect working order, very good condition.
Right hand, the lock plate and hammer are factory engraved, and color case hardened. Notice the late style hammer, with a curled finger spur, and they require the new short nipple.
This lock has a powerful coil mainspring, fly detent for use with double set triggers, and it is tapped for an 8-32 lock bolt, sold separately.