First handgun produced by Marlin. Barrel 2.0625" long and pivots to side for loading. There is a plunger under the frame that is depressed to free barrel. This device is a Ballard patent. Chambered for .22 rimfire cartridge. No extractor. Frame brass and usually nickel-plated. Has two grooves milled beneath blued barrel. Grips are rosewood. Barrel stamped "J.M. Marlin, New Haven, Ct.". Approximately 2,000 manufactured between 1863 and 1867. Quite scarce on today's market.