(1893-1907 James Hibbert/1907-1947 J. Allen & Sons/1947-present H.M. Slater) The trademark “heart and percussion pistol” was first used as early as 1780. The original user was Jonathan Crookes, 1780-1827. The firm became & Son about 1827. In 1907, Joseph Allen and Sons took over the Crookes company. H.M. Slater is currently using this trademark. All companies using this marking are from Sheffield, England. This marking has been used on all types of cutlery, including “Bowie” type knives.
c 1780-present