What is it for ? Found on French flea market. Looks like it should be on the end of a stick to add ‘something’ to a (hot?) liquid. By pulling on the chain cord it opens a small bleed hole at the bottom. But to put what in to what ?
I figured that it should be on a stick and held in some sort of liquid under a angle so that the black ‘window’ (it’s not a window but a black painted part) is level with whatever it’s been held in to. Then the chain is pulled to release a certain amount of something in to ......whatever . Big pot of honey? , soup? Wine?