Just spotted that the next auction at Southams, Bedford, here in England has a pair of 12 bore shotguns with 2" chambers. Barrels are 28". Weights are about five pounds and four ounces each. One has been sleeved. They are Lot number 850, estimated to sell at between £800 and £1200, or $1100 to $1600 plus fees etc.

Their previous history would be an interesting tale...

HB