I dug this revolver but its in bad shape cant find a makers mark on it..I guess its under all that rust its has the number 418 on the handle..Its 6.5" in length and the barrel is 2.5" long..
Most likely .22 or .31 caliber.Most likely cartridge.You reload it by pulling the cylinder pin.Octagon barrel.The problem is there were a lot of makers.I just looked through a few hundred pictures.Came close but no cigar.
After comparing the two photos, yours is not a Smith and Wesson, and at this point I don't even have a guess. Several companies made guns like these, but yours doesn't break open like a S & W. In your research watch for the brass frame, birds head grip, octgon barrel that doesn't break open.