An 11 bore double percussion gun

An 11 bore double percussion gun, by Williams and Powell, 33 in. damascus barrels, Brimingham black powder proof marks, hooked breech, engraved tang, top rib engraved '25 SOUTH CASTLE ST LIVERPOOL', acanthus engraved locks signed 'WILLIAMS & POWELL', chequered straight hand stock, later brass mounted wooden ramrod with worm under screw off cap.