An Engraved Glass Tumbler from the Service of the Yacht 'Onega'

An Engraved Glass Tumbler from the Service of the Yacht 'Onega'
Russia, Imperial Glass Factory, second half 19th century
Tapering cylindrical with everted rim, engraved with the Imperial double-headed eagle holding crossed anchors, the lower section of the body faceted, apparently unmarked
3½ in. (8.9 cm.) high