smp190,
The mark under the 484 is not a proof mark, it appears to be the "house mark" for the Zella Mehlis Proof House ( i.e. Z and M). The gun was not likely made by E. List, rather it was likely made by one of the makers in or around Zella Mehlis and maybe marketed by E. List. I said "maybe" because the rib where his name is stamped seems damaged. It opens the possibility that one owner was E. List and the stamp was a DYI effort. Of course, the possibility of ownership is pure speculation. A barrel with the Crown W was choked but at that time the constriction was not shown. Experience shows that most were tightly choked, especially so with "shot cups" or "collars".
Mike
