I would say Bohemian for sure..... The exterior is like Mother of Pearl by Kralik, but Welz also did similar iridescent exterior finishes... The color is delightfully unusual for either house, but would lean me a little more toward Welz than Kralik.... The exterior bevel on the rim would lean me towards Kralik....... Could also be an unknown house...... we may never know.
The answer would likely come with the shape.... if it can be identified in a more recognizable and distinct decor associated with a specific known house....
Great piece.....
Craig