The last variation of the Le Mat revolvers based on a 1869 patent, matching serial # 31. While the upper barrel is for a cartridge caliber 12mm, the center barrel is for 20 gauge buckshot. The cartridge barrel is octagonal with a fixed front sight, the shot barrel is round, both are 4 ⅝” long. The lower barrel firing pin centrally mounted in a slot in the hammer with a rear facing lever that flips forward to fire. The top of the barrel is marked Colonel Le Mat Patent with inspection stamp.