Allen Center Hammer Single Shot Pistol. 2" barrel is chambered for 22 rimfire and has a pitted bore. This little pistol is only 3 ¾" long and it's marked "E. Allen & Co. Makers" on top of the barrel. The brass frame has a pleasing patina and the wood grips are in excellent shape. The barrel and hammer are a gray-brown mix and brass frames on this model are rare. Estimated Value$400 - 500.