Have I any chance of working out where and when on this one?
I've been reading up on Nostetangen in my books and the very scarce information I have on Scandinavian production from that period.
From the Nostetangen website it says
'German potash glass was used until about 1756, when the English lead glass appeared.'
and
'Glass production was ceased in 1777 and moved to Hurdals verk.'
I think I read in my books that Hurdals verk used lead glass?
So if my flask is not lead glass then might it mean that perhaps it's not Norwegian?
Also, are there any clues in the engraved subject matter? It doesn't strike me as Bohemian or German, not that I would really have a clue to be honest.
it's a minefield out there

especially when you have no clue about this type of glass at all.
m