This is one of the most remarkable pieces of glass I have ever had the good fortune to purchase, a dekelpokal or covered goblet standing 23"/59cm tall and weighing almost 5kg.
The green is a uranium glass, most has been cut away to reveal the white underneath, the white does not appear to be opalescent. The foot is hollow, that small hole on the base is a curio, not sure of the purpose.
I am tentatively dating it to circa 1845 given the similarities to the white alabaster glass with pink overlay shown in photo IV.3 of the PDF that flying free linked to here:
https://www.glassmessages.com/index.php/topic,69749.msg388727.html#msg388727The spiral or rope cut and the small flower bouquets match pretty well.
Opinions please and would the style be described as Biedermeier?
John