Hmmmmm, well, they could very well be American however, its hard to tell from pic's with all that paint if the hardware is actually 18th century. The door hinges appear to be 18th century "tulip" hinges, popular among PA german settlers. The question is though, are they hand wrought iron, impossible to tell from pics. The door knob/handle appears to be of a much later date.
A couple things to keep in mind about 18th century american hardware. First off, we were english citizens and two, colonists were PROHIBITED from setting up foundrys to cast brass, why? Economic was one reason, the brits wanted to sell finished brass goods to their colonies and then there were political reasons. Cannons are cast from brass & theres no telling where that could lead!
What all this means is, blacksmiths made everything from nails to hinges to anything that the local smith could produce with a forge and hammer. Almost ALL brass brass hardware was imported, mostly from england. Still, to most collectors original hardware is still a BIG DEAL whether imported or not. So, what we see today on pieces that have original hardware is, if its brass, its most likely imported, if it's wrought iron, its most likely made locally.
