I would run away from this one. The very flowery description tells me nothing about proof status, wall thickness etc. What proof marks I (think) are there are BP only. Although Wilkes did make a few guns for the trade there is no evidence that this is one of theirs.Most likely from Scotts as evidenced by the 'patent' top lever(without mention of patent use as for the A & D action).
Not a clue where the beads came from, original they are not.