In article >, says...
>
> A real puzzler. The seller lists some guesses,
> but none seem likely to me.
>
> http://www.ebay.com/itm/160799433505

It's an old brandy warmer; the brandy goes in the cup, beneath which
there would have been a tiny flame (a candle, or meths in a little
holder).
When the brandy is warm the cup swivels to empty into a glass.

Janet UK