John-

Although all I know of this pistol is what we see here, I'm convinced those barrels are damascus -- or a very convincing facsimile of damascus.

I very much want to see the proofs, the lugs, and the lumps.
I'd like to see a chamber cast, or a fired round.
I'd like to see down the bores.
For kicks I'd like to see what's going on inside the locks.

I haven't seen a hammerless Howdah Pistol based on a hammerless rifle platform, besides a couple of short barreled martinis -- which I just don't count in the class of Howdah. I've seen the Lancaster four barreled pistol which some folks refer to as Howdah pistols, which I also just don't consider howdahs (even in '577' the revolver round, it still was a anti-man not anti cat pistol).
...but I haven't seen a DR-design-based Howdah that wasn't a hammer gun.
The AnsonDeeley boxlock dates from ...1875 with safety in the early 80's?
I think an AD boxlock Howdah would work -- design wise, but just haven't seen it.

Could be that by the time hammerless rifles were vogue, the time of the Howdah had passed.

I've had my eyes out for hammerless howdah pistols.
I'd be happy to see a real-assed hammerless Howdah, perhaps someone here can show us some images...

--Tinker