Steve, my Powell, 4661 is numbered on the barrels, the forend and the trigger guard strap. Another gun from that period (W & C Scott, badged Chas H Maleham) is numbered (1633) on the forend, the flats of the action, the top rib and the trigger guard strap. The tubes themselves are not numbered, but since it is sleeved, they may well have originally been numbered.