.28 Brass mould with iron sprue cutter finished “in the white”, for Colt Model 1855 Root percussion revolvers, from 1855 until the end of production. Bowleg mould, stamped “COLTS / PATENT” without an apostrophe, on the top face of the sprue-cutter, close to the hinge. The two cavities, are for a round ball, nearest the hinge pin and a conical with a heel grease groove below it. The groove helps facilitate loading into the cylinder chamber. The locating pin is on the right leg. There is an factory inspector’s letter “B” stamped on the face of the right leg. This mould is correct for all .28 calibre Colt Root revolvers.