Thanks for looking, Pamela. I think this basic type solifleur has had versions in Germany, Scandinavia, and apparently also Czechoslovakia. I have seen quite similar type solifleurs for instance from Marsberger Glaswerke, Ingrid Glas and Schott Zwiesel, which means that the example you show doesn't tell me as much as I'd like.
I believe the label on the double one to be genuine, which would mean a German language country, which rules out Czechoslovakia, unless the St in G would be a retailer or distributer instead of a factory (but for now I'd rather assume factory).
Astrid