threaded

Hi, I recently found this at a pond's edge in New England and wondered if it was some type of lighter or related box? The inside is empty. Thanks!

First off, I am new to metal detecting and I would like to say hello to everyone! I dug this strange thing up yesterday and thought it was maybe a tiny bowl with feet, until I cleaned it up and saw the threads. It is about 2.5" in diameter. One friend thought it may be a cap from some kind of...