I can't tell from the pics, but it looks like an Iver Johnson or H&R from the late 19th to early 20th Century. So, try searching- What ever it's manufacture's name is with break open revolver- and your screen will be flooded with information regarding what ever you want to know about it. It's really that simple. Not trying to be mean or rude, just pragmatic. The combined knowledge of mankind is at our finger tips on the World Wide Web. It might take a little time & effort on your part, but what you want to know about that revolver is there for you by merely clicking your mouse. Good luck on your quest.