Also described in ‘Pistol & Revolver Cartridges’ by White & Munhall as the .410 Revolver (Long Case).this was a British development and was developed in the mid 1890’s and listed as a cartridge “for Colt’s and other revolvers.” The length does not correspond to any US type .41 cal however although the rim diameter is the same as the old 41 Short Colt Single Action. (Erlmeier, Brandt Ref. 396)