My wife just brought back her great grandfather's gun - and it's a strange looking thing. It's a single shot hammer gun, with the hammer over on the right side, to the right of the top lever. No markings as I can see. But I haven't figured out how to get it apart yet, so I don't know all that might be there. It looks like it was a low end gun when new, and it's a wreck now, but I'm curious - was this ever a common configuration in the past?