Two variations of this spur trigger .38-caliber revolver exist. One with rounded grip and no barrel rib; other with squared back, squared butt grip with barrel rib. Centerfire versions are also known and are worth approximately 10 percent more than values listed below. Blued or nickel-plated, with hard rubber grips. Approximately 25,000 manufactured between 1878 and 1888. NOTE: Add 50 percent premium for blued finish.