This pistol is a single shot 410 guage 12 M/M choke .
HARRINGTON & RICHARDSON ARMS CO. WORCESTER, MASS .
U.S.A. The only thing that i know that is missing is the little ball site at the front of the barrel . I understand for me to sell this pistol , that you must have a federal firearms license ( FFL ) . The pistol looks to be in very nice shape.