It's almost definitely copper with the way its oxidised. If the glass is Pyrex then it'll be no earlier than the 1920s or thereabouts... can't quite recall when Pyrex was first introduced.
But is it possible that the glass is not original? I would have expected a fluted shape... but maybe one of the others can put me right there. From the pics it almost looks as if someone may have replaced it with a test tube
But it is hard to tell.
I wouldn't give it too much of a clean, the oxidisation or I suppose you could even call it 'patina' adds to its charm.