Mark,

If you scroll to the right you can see the proofs, which as usual are not very revealing as to the maker. 70mm chambers is nice and the tubes are stamped "H.H.".

John,
That's an interesting gun and the scroll work on the bottom of the receiver is lovely. Though to ME, the marketing of "poudre vives" on the rib is usually something I've seen on lower end guns. Then again, I'm far far from an expert.