J.O. Mayne of London 16 gauge Damascus barrel top lever hammer gun, semi pistol grip, round action and back action hammer side locks, both engraved J.O. Mayne. In fair to good condition overall, black powder proof only and a decorator. Contained in a later leather covered wooden case in poor condition overall with a paper label of Charles Smith, Newark on Trent, England, containing a three piece ebony cleaning rod, pull through and four cleaning ends