Mikey,
Not sure who made the Howdah pistols, but as I recall from an American Rifleman article several years ago, they were peculiar to tiger hunting in India. The name was a reference to an Indian region, I believe. They were also made in 4-barreled versions. Maybe a local fabrication from the Pakistani-India region famous for home-made guns? I must hand it to those technical advisors in TGATD film. They made every effort to show authentic period firearms. Yeah, I can see it now: BATF frowning with disapproval at someone that has a sawed off shotgun pistol....
John