identifying warded rim 19th century lock in house museum

[quetzal1234]

Hi everyone:

I'm a researcher working on a house museum. I've been tasked with finding out about the massive lock on the front door. Family tradition (as in the family that owned the house) says it goes back to the 18th century, but it has machine screws and I would be shocked if it isn't 19th century. The curator is looking into taking it off the door to look for makers marks, but since this a museum setting, this may not be possible. It is fairly distinctive, so I'm hoping someone will recognize it. It's probably New England made.