This is a pretty decent Marlin 38 Standard 1878 Pocket Revolver with spur trigger. The bore and mechanical function are very good and the serial numbers 1974 all match. It retains 90% The nickel on the left side and 85% on the right. There isn’t any rust or pitting anywhere on this one. The grips are very good with out any damage and the checkering is sharp. It was probably made in 1878 or 1879 with such a low serial number and is 38 S&W centerfire caliber.