I also have one of these, except mine is better looking and has knurlier stag!
I don't know how to prove it, unless I can dig up the invoice that I likely have someplace, but mine was one of 6 samples originally sent to the East Coast pre production (6 were also sent to the West Coast). I was hoping they would not go into production, but they did. (They do not have SNs).
I remember purchasing it in a Gun store in CT that my Uncle knew about.
https://www.ebay.com/itm/Vintage-St...h=item4b563af18b:g:CWYAAOSwnh9b-4x9:rk:2:pf:0