A .500 (3IN. BLACK POWDER) D.B. HAMMER RIFLE BY HENRY W. EGG, No. 3803, possibly converted from percussion, Jones patent rotary-underlever, non-rebounding backlocks with bolted hammers, percussion fences, some foliate-scroll engraving, stock with pistolgrip and heel and toe plates, sling-eyes, the rebrowned damascus barrels with open-sights