having provision for a .36 calibre and .45 calibre round ball, the three section mould somewhat similar to those found for Colt Walker revolvers, the sprue cutter having raised turned wooden handle, "Colts Patent" lacking apostrophe, turned side handles. It is suggested that it was made for the London model Colt pistols circa 1851 and around the time of the Great Exhibition, possibly for a cased set of .36 and .45 calibre.