A .410 (2IN.) SINGLE-BARRELLED HAMMER GUN BY J. LANG, No. 4396, converted from a rook-rifle calibre, Jones patent rotary-underlever, non-rebounding backlock, percussion fence, elongated top-strap, best foliate-scroll engraving, boldly-figured stock with pistolgrip, engraved pistolgrip-cap and horn extension, the barrel with breech-end of octagonal section and circular muzzle