This Thompson Center manufactured first variation rear sight base is for the early Hawken muzzle loading rifle in 45 or 50 caliber with the threaded hole spacing 1 1/2" apart (center to center) and is in very good condition exhibiting a mixture of thinning original blue finish with a brown patina and having light wear. (file photo)

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

Percussion: 73609, 111807, 130609 & 239982

Flintlock: 11555

Kit in Percussion: K145177 & K188746

Kit in Flintlock: K80324