I don't know if the frizzen was ever refaced. Maybe it was made with a facing. I'll have really good look at it in bright light and see if there are any clues. The area of the face where the flint first makes contact can be felt - the lock has certainly been snapped.
I have not fired the gun, so I cannot comment on how fast it fires. The lock does spark! I doubt that a British sportsman who could afford a first class gun would accept less than stellar performance.
The gun is certainly shootable - I've just never done it. I'd feel sick if a spring were to break, or the gun damaged. No springs have failed in 195 years, so probably aren't going to now.
The touch hole is the usual platinum type, w/patent breech. Here is the bore, with a little penlight at the bottom, pointing toward the breech plug.
I really had hoped that the buyer had been recorded in the record book, and that I could trace the gun. It came to Canada in 1962. The previous owner's grandfather was from Scotland, and had acquired it post-WW2.