A beautiful double rifle. There isn't any doubt that's a NY gun. I don't believe doubles were ever used for serious target work. It should be rifled for a picket bullet.
The first rifle could easily be New England made also. There is no essential difference in the style, just that many more seem to have been made in New York. One of my all-time favorite makers is Joseph Tonks of Boston. I've only seen three of his rifles and a couple of shotguns but they are one of the very very few American guns that actually rival London "best" quality. I can only think of one other maker in the same class and he was in Boston also. (I have a detached, left hand lock) Tonks apprenticed at Rigby's so calling him an "American" maker is borderline. He may well have ordered his locks from Brazier's in Birmingham like all the great makers did by the 1850s but his stock work was superb. I have a fantastic rifle barrel, Birmingham proofed (on the bottom) "Lane & Read Boston" on the top flat, that came from a cobbled up piece of junk that I'm saving for a rifle project some day...the problem is that I'm nowhere near good enough to make a rifle that reflects the quality of the parts.
As an example of Tonks work... a couple of years ago there was a big sale of a NE collection that had three Joseph Tonks rifles in it. Two were of the hunting/target configuration and both went for about three times what a rifle of this type usually fetches. The third rifle was a heavy bench rest target rifle with a telescopic sight, false muzzle etc. Except it was refinished and the collectors, while they liked it, were completely outbid by two gentlemen in USA Shooting jackets. After the sale we were talking to the man who bought the first two rifles. He openly wondered why they'd payed so much for a refinished gun. My colleague asked "so what would it cost to have a rifle like that made today?" "Oh" he said. I see what you mean.