I thought about that possibility, too, but couldn't make the tapered screw hole work.Rain cap for a tractor exhaust? Missing the ring attachment if it is. Just a guess.
View attachment 2018237
That looks close, but not convinced that is what it is.View attachment 2018313
Identified on the other thread for this relic:
Oil filler cover for an antique engine?Apothecary weight cup lid. 17th Century. That's a cool find. I've seen the cups and weights posted on this forum. Never a lid that I can remember.