The glasses are so called uranium glass.
Unusual glass with mussel painted decoration.
The glasses are mouth-blown with facet-cut stems and pantographed decoration.
A pantograph is done by covering the glass in wax, in which the subject is cut with minor wheels and then dipped in acid, so that the motive is etched into the glass.
The design is Blue Fluted Half Lace, known from Royal Copenhagen.
Denmark
Deutschland
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