This is a very nice cased blue 1878 D.A. with British Proof marks. It is serial number 3117 and was made in 1879 and retains over 94% original blue finish. The grips are excellent plus condition without any chips or cracks. The mechanical function is excellent crisp and tight and the bore is excellent bright and shiny. It is a 5 ½” barrel. The case is very nice with Colts Pall Mall London label and contains a cleaning rod, oil bottle and the working key. The wood cartridge board has holes for 18 rounds.