Curious about this tumbler mostly because it is outside my usual interest, maybe not so surprising in those circumstances but I don't remember seeing any others.
The tumbler is fairly thin walled and the pattern is quite crisp and prominent, 10cm or 4" tall, the rim has lost nearly all the enamel and the yellow flowers are pretty worn, cold painted? Could the leaves and flowers be hop? The general texture is reminiscent of several Bohemian makers Martele patterns.
John