Patented by Owen Jones, shoots either .22 Rimfire or .32 Rimfire. Extra cylinder stores inside of the handle. The barrel on this extremely unique pistol actually rotates rather than the cylinder! The second and third models were improved to tip up, then rotate. It's unknown where they were manufactured at, but the educated guesser's say that it was probably made by Deringer Rifle and Pistol Works of Philadelphia around 1875.