Evidence: here you are - you're welcome
https://sbirky.moravska-galerie.cz/dielo/CZE:MG.U_24893Took me many years of searching collections (in Czech) to find that.
That one they say is Czech. It looks like it might have been decorated with platinum. I think Harrach used platinum. And Harrach I believe did the gilding on mine.
However, just to add, I always wondered if mine could have been Russian. Couldn't find a link on shape but the decoration on mine is seen on pieces that have been identified by Bukowski as Russian. They could have been made in Bohemia for the Russian market, but the shape on a jug they show is quite a Russian shape so at the moment I think Bukowski's could be right. It's not the same shape as our curious shape but it has a 'Russian' shape to it. It also has a link to a caviar bowl in the set. The little jug with the similar decoration to mine also has a similar star cut base as mine.
That said ... Russian glass is extremely rare so to have found mine, yours, a blue one Greg has seen and the one in the museum collection would be quite a few really. A few too many for it to have been Russian glass produced perhaps. And no shape link I could find so far.
However the colour and cutting on yours does remind me of a small liqueur glass I have that is id'd as Russian (attributed to I think Bakhmetev ) by Dr Fischer Auctions.
So that along with this blue set (Greg saw a blue one) from Christies is slightly more interesting:
https://www.christies.com/lot/lot-5274628m