Holt's had an H&H Dominion with 2" 12ga barrels and 2 3/4" 20ga barrels that didn't sell in their March auction: http://auctions.holtsauctioneers.com/asp...049&image=3

Pretty steep estimate for a Dominion with a stock extension, but I bet a 5 pound 5 ounce 12 bore would really be something.