A weird item here. It is a blown bubble with a large 6" (16cm) flange. The bubble has a broken pontil where you'd expect it, and a small flattened section to stop it from rolling around. The hole is 3/4"(2 cm) so large enough for a large single flower or small flower arrangement.
Now somewhere in the back of my mind it says "Finland" - maybe because traditionally in the nordic countries flowers were so expensive that they made vases for a single flowers, or maybe the intense green. Or maybe there are other solutions?