Welcome to the forum , cjolly .
Nice unusual item you've got there , on your nicely set table .
Appears to me , from your images , that the knob on the spigot is bone or ivory .
As others have posted , hallmarks on your item(s) are a bit of a key for members to be able to research .
Such marks can clairify the silver content of your items , as well as other good data .
There should be hallmarks on the 'cup' , vessel & stand (& maybe on the burner assembly as well) to choose from (for photos) ... they can be a bit of a pain to photograph , due to being on reflective surfaces & small size .
I'm thinking , at this point , that it may be , perhaps , a multi-use warming vessel .
I'm a bit curious to see an image of the top of the vessel & also to know how far (roughly) the pipe extends into the cup .
Thanks for all your postings & images so far , cjolly .