While White & Munhall identified this as a 'Mauser Pistol' cartridge, the European Cartridge Research Association database refers to it as '.45 Maxim Pistol', and Dr Geoff Sturgess has presented good evidence (Journal of the Historical Breechloading Smallarms Association, Vol. 2, No. 6, page 5) that it is linked to the 17th November 1885 Patent Number 14047 model of Sir Hiram Maxim's pistol design. This is a delayed-blowback adaptation of Maxim's short recoil locked breech machine gun design covered in his 8th July 1885 Patent Number 8281, and employs a tubular magazine beneath the barrel. The cartridges in the Patent drawing bear a strong resemblance to this cartridge. Its considerable taper would have allowed the case to set back immediately and facilitate the delivery of energy to the breech face without gripping the chamber walls too tenaciously, as would have been likely with a conventional straight-cased revolver cartridge. It appears to have been cut down and formed from an Eley .450 rifle cartridge case. The cartridge is almost certainly black powder loaded, and would have soon been eclipsed by the development of smaller-bore smokeless self loading pistol cartridges in the early 1890s. Very rare.