WWII International Register Co. IBM M1 Carbine Rear Sight

This is an original WWII M1 Carbine, stamped rear adjustable sight made by International Register Co. for use on the very late 1944 production rifles by IBM (International Business Machine). The sight is in excellent condition with signs of being mounted but only light use, knob knurling is sharp and knob advances correctly. The right side of sight is marked "I.R. CO. over 7160060". Reference Collecting "The M1 Carbine III" by J. C. Harrison" pg 91