These were also called Bull Dog because of the caliber. It retains 65% barrel blue and 40-45% case colors. The mechanical function is very good crisp and tight and the bore is very good rifling, bright and shiny bore with a few spots of corrosion. The grips are very good without any chips or damage. These were made 1866-1880s. The serial number on this one is 3831 and about 8000 was made.