Its a bicentenial Navy Arms Bess by Pedersoli. The trigger guard lug pin is through the lock mortise and not the bottom portion of lock panel, this is actually correct not like the current model In production. I have the same pattern bess, the only thing I changed on mine was I had a jeweler change the Lockplate from Grice to Tower, I reduced the wood around the lock and tang Slightly because when I bought the gun it had damage to it. Otherwise I didn’t go crazy on a defrab.
The coach harness bess had a much more correct stock pattern, larger butt stock and wrist And I’m not certain but I do think they were stock in English Walnut.
This doesn’t look like a coach harness bess at all. Not to mention a 46” barrel that would have Birmingham proof marks.