All three are constructed of steel, with no maker's markings, are approximately 8" long, single cavity, and a sprue trimmer. 1) Sharps 1853, .54 caliber, with "60" marked below cavity and "32" on one of the legs. 2) Sharps mold updated to 1859, .44 caliber and marked "66." below cavity. 3) Sharps 1851/1853, .50 caliber (no markings).