I'm new to the site and hoping to get help identifying a couple of Civil War era guns that my Dad owned (will do separate posts on them). He had an 1860 Spencer, Rifle Co. Boston Patt March 1860. The serial # is 50833 or 50633 (have photo) so asking if it might be traceable. The letters "OGP" are stamped in the metal on right side and on the left side of the stock. Would this be an inspector stamp? I searched a couple of Springfield inspector lists, but did not find these initials. My dad said that he bought the Spencer in 1945 from a farm neighbor in southeast Kansas - paid $1.50 for it. One of dad's grandsons would like the gun so I'm trying to collect a little history info and approximate value so the grandson knows what it is and takes good care of it. Thanks for any help.