This so-called "Krautstrunk," this glass was used as a reliquary
Krautstrunk means coal stalk. The design of the glass is reminiscent of this.
The top is covered with wax, with two stamps on it.
Archaeological find, entirely intact.
Germany, Middle Ages, circa 1500.
A number of specimens are in museum collections:
Corning Museum of Glass in New York
Metropolitan Museum in New York
Victoria & Albert in London
The Cloisters Museum in Manhattan.