At the risk of being excommunicated from this august forum I'll confess to having received a "new" 10 bore yesterday. It's a William Moore of London made no later than '75. Jones underlever, laminated barrels, and forend wedge. Plain gun but in very high original. condition. Weighs 8/14.
Leighton, thats a serious 10 bore you have there.
William Moore, circa ? to 1875