for obvious reasons tourist glass travels the most - hence why such pieces predominate in places far from their origin, although all glass travels to some extent. I doubt this one was ever made to be used - just a memento of someone's holiday, but it's attractive.
Roemers make for a good collecting theme, the problem being that those from the C15 and C16 tend to cost an arm and a leg.

Traditionally, the coiled stems were decorated with raspberry prunts (slightly flattened copies of the raspberry fruit), and the origin of the word may possibly be from the Lower Rhenish word 'roemen', which apparently means to boast, and seems the spelling is sometimes rӧmer, but no idea why the two spellings.