Apologies for the delay in getting back.
Wow, many thanks to everyone for the contributions and interest, much appreciated. There's some very impressive research here!
The height of the wine glass is 135mm and the champagne 110mm so not a match for the French glasses but still a possibility.
I'll try to contact Lobmeyr (who didn't pioneer iridescent glass!) and see if they can throw any light on a possible attribution.