Its fairly light about 100-150g so we can assume that its hollow.
Don't think there is any hallmark, but then again I'm blind as a bat when it comes to these things.
How do i check to see if its brass or copper?
I don't think its suppose to be use for consumable as its too small, only 9 cm in height plus no opening.
Its tiny so you can assume that it spent most of its life indoor which could explain the no patina.
This styling reminds me of something that I've seen before, but can't remember what. Does it reminds anyone of anything?