This was most likely made by Harrington & Richardson and has a Patent Date April 5.1887 and is SN 650. This is 44 Bull Dog centerfire caliber and has a very good bore with strong rifling. The mechanical function is very good. The grips are fine and it retains over 84% original nickel finish. This was designed to hide out and no hammer spur to get into the way. This is a D.A. only 5 shot with a 2 7/16” barrel.