I've been looking thur the books I have and trying to figure out this...in 1939 the words "MODEL-12-TRAP" were stamped on the bottom of the receiver extension.....did this indicate a Trap gun or a "trap grade" gun? Where was the "pigeon" located on the gun if "MODEL-12-TRAP" was stamped there? Last question..I recently saw a M-12 Super Speed 3 inch with a solid rib at a gun show, is this a collectable combination? Thanks, WC