A parcel-gilt mounted and engraved ruby glass cup on foot

Glass: South Germany (Munich?), late 17th century
Mounts: Augsburg, early 18th century

Provenance :
Wittelsbach Collection, dukes of Bavaria

Literature:
Brigitte Klesse et al. Ein rheinischer Silberschatz - Schmuck und Gerät aus Privatbesitz. Kunstgewerbemuseum, Cologne 1980, pp. 272-273, n° 401 (ill.).

Condition:
slight crizelling and three small chips on the upper rim