Flayderman's Guide lists less than 100 of these as estimated to have been manufactured c. 1861-1863 and note: "Based on the Army Model Center Hammer Lipfire revolver, Allen & Wheelock was attempting to add still another variation of firearm to their diverse line. The result for today's collector was one of the scarcest of revolving rifles." Like other known examples, there are no identifying markings. This one does not appear to have a serial number. It is fitted with a Beach style combination blade and globe front sight and an elevation adjustable notch rear sight. The trigger guard operated the ejector rod. The nicely figured stock has a checkered wrist and crescent buttplate.