My first impression was the stamp is a date code. Which makes it either 1872, which would make it a antique, or 1972, the later I was leaning towards. I did look around in my books and surfed a bit, and did find a small blurb on a J. Foss but the date was early 1900's, and not much, or enough to make a discission on the date. Just a first glance it does not look old enough for 1872. Without hallmarks, and just a signature to go on the wall is thick and tall. It does appear to be what is called Flow blue, but that would help little in your search. My conclusion is you have a vintage at best piece that value would be low. The others may have a better knowlege and books to help reference it.
Thank you very much, that is more than I found.
Any guesses as to what is being depicted on the teapot? I have some guesses, and will throw them out, at the risk of seeming ignorant with my second post.
(1) Paul Revere's Midnight Ride
(2) Teaparty related (it looks in one place that a crate is being over-turned
(3) Related to house raids linked to witch trials?
It really is a pretty, unique piece. I have little intention of selling it but am curious to find out all I can.
Thanks, I'll research what you posted and learn more