Hi,
Welcome to the Forum.
Well, I wish I could find such things up my Dad's loft!
It's a chocolate pot, see:
http://www.925-1000.com/silverglossary2.html. Made by the wonderfully named William Paradise and assayed at London in 1724.
I'm very curious regarding the mark on the far left of your mark image. Can you try to capture a clearer image of it?
Regards Trev.