Mini brass bowl?

[DIE HARD]

Heavy solid brass bowl big as a quarter no idea what it is.

 

[Icewing]

First thought, baseball display stand.

 

[sprailroad]

Had something like that, or very much so, many years ago, used for burning cone shaped incense in.

 

[cudamark]

Soft boiled egg cup?

 

[HuntinDog]

I would say it's the bottom half of an early version of the Vanishing Ball Magic trick.
Had a brass one as a kid (way)back in the day....