H&R Harrington & Richardson Top Break 16 Gauge Mod Single Shot Shotgun - Single Shot Shotguns at GunBroker.com : 973958022
U.S. Single Barrel Shotgun Identification | Shotgun Forum
Hardware merchandising (January-March 1908) . H & R SINGLE GUN, MODEL 1900. Automatic and Non-ejecting-. 12, 16 and 20 gauges, plain steel barrels ; 12 and 16gauges also with twist barrels.
Harrington & Richardson Single Shot 12g Shotgun | Chesapeake MarketPlace
Choate Pistol Grip H&R NEF 12 16 20 410 Ga Composite Black