A Fulton recently sold on GB. Go to advanced search for compleed auctions for Fultons. Maybe someone can paste a pic; item #311449533. It is the first Fulton I've seen with USA-F on the barrels with no other military marks. I have seen one Fultom with full military marks.
I have seen two Elsies with the USA-F marks on the barrels and no other military marks. My Wild Fowl has the military marks on the flats, but no USA-F on the barrels. My FW ordnance has all the marks. All Elsies or Fultons I have seen with USA-F marks only were all in the serial number range that were sold to the govt.
I just wonder if barrels were prepped before the flats thinking they would be military before maybe a stop order came through. But then you have some with ordnance marks on the flats, but no USA-F.