This is a second style Colt Navy brass .36 caliber bullet mold that is correct for the early Navy squareback percussion revolvers. The mold has the round ball and the distinctive second style heeled and pointed conical (see Rapley's "Colt Percussion Accoutrements, 1834-1873, pages 238-239). The sprue cutter has a Colt factory small letter "R" marking. The right side of the block is marked "COLTS/PATENT."

Fine. The brass has a bright appearance with some minor dings, and the sprue cutter has a mottled brown patina. A solid example of a Colt accoutrement for your early Navy squareback percussion revolver. If you pass on this, there is a high chance that you will regret that decision in the future.