This Thompson Center manufactured early variation brass butt plate screw with an unthreaded section under the head is for the earlier Hawken muzzle loading rifles and is in very good condition with light slot wear and a moderate tarnish. (file photo)

Note: Thompson Center Hawken muzzle loading rifles with the following serial numbers have been observed with this screw:

Percussion: 73609, 111807, 141298 & 275512

Flintlock: 63277

Kit in Percussion: K145177 & K188746

Kit in Flintlock: