I had one of those, probably shouldn't have parted with it. 12ga, under 6# with 26" barrels, nice condition, good dimensions. Steve Barnett has a gorgeous Diamond Regent 16ga in his current inventory. He only provides very basic information on his website, but given the particulars, I'd guess that one--at under 5 3/4# with almost no choke--might have been a special order for some wealthy Yankee grouse and woodcock hunter, or perhaps a Southern gent quail hunter.