There were about 22,000 of these produced between 1863 and 1872, of which many were made for or converted to cartridge use.  This one, SN 7875, has a 4 1/2" barrel and has all matching numbers including the wedge. A grey and brown patina on the barrel, cylinder, and frame. The brass gripstraps are a nice unpolished patina. The grips retain about 75% of their original finish with no cracks or splits.