There are certainly lots of opinions right now, all of them speculative.
I have been researching a lot of graffiti style things.
Really large refillable paint markers, as well well as small cans of spray paint.
Small in diameter that is, not in height.
If I am wrong..so what, it was fun trying to help identify something.
I still think it is a simple can of some sort, possibly with all the details added with a marker or clear stick on transfer.
This would also help to create the window.
The window area to me just doesn't look like a clean enough cut line to have been machined.
That doesn't mean it wasn't, just my opinion.
I also wonder if the prongs on the top aren't some sort of pin connector, again, just an opinion.
I am certain somebody here will figure it out eventually.
The biggest reason I thought of the marker/paint pen idea is that the black part on the bottom fits there really nicely.
That made me think of a marker cap.
I also think that the cap may be a clue to the actual product.
On pens and markers I have seen that little injection molded nipple in the center.
I don't recall having seen that on other types of products.
I could be crazy, wrong, steering people in the wrong direction, whatever.
Have fun, work together, and we will figure it out eventually.
Or someone will take the time and actually machine one and hopefully offer them in the jy.
Scott