Can anyone identify this for me? I thought it was unsigned, but I recently found scratched very lightly on the bottom (as if with a stylus rather than an electric engraver) Kosta LH 1567. Really too lightly marked to photograph but clearly there under a strong light.
It is 22mm tall (8 and 3/4 inches) with some scratches on the bottom, but no other marks. It is clear glass, with a tiny bubble in the direct center of the base. It still has the glass stirring rod.
Anybody seen it before? Any idea of its age?