Twaits, You have a rare edition of the Merwin & Hulbert Automatic Ejecting revolver. Get yourself a copy of "The Story of Merwin & Hulbert Firearms" by my old friend, the late Art Phelps, and read up on them. You have two features seldon seen, the "Skull Cracker " protrusion on the butt and the second side panel screw. Both are very rare, in fact the book shows a picture of a Merwin with the 2nd screw and says " Only one known !". I think there are more, but the are seldom encountered. The 2nd barrel was often added to Merwin purchases, but seldom are both numbered the same, which would prove they came together as a set when new. The Game scene could be factory, and at least dealer added, and could possibly be etched rather than engraved. Value, as is, is well into 4 figures. Ed #15