This is the .45 Turkish Peabody-Martini Carbine discussed on p.219-220 of Hoyem 2. It uses the same rim and base as the standard Turkish round but there is however no record of the cartridge ever being used by Turkey at any stage. It is stated that the cartridge was listed in the Providence Tool Company catalogues and according to Hoyem, the contract for the production of the rifles for Turkey was gained by Oliver F. Winchester but that he sold the contract to the Providence Tool Company who already had the facilities to produce the rifle.