This small dish is very thick glass - similar to a Per Lutken donut in size. It is of course clear, has a well finish flat, polished pontil. There are no makrings.
Its feature is those beautiful swirls of controlled bubbles. It looks much better than the photos I managed to get.
Any idea for a maker? I suspect Scandinavian - leaning towards Holmegaard - BUT no signature.
Ross