John thanks for that Orrefors suggestion.
I've been looking at their signatures and see you're right. Usually in full, but also abbreviations and even just a numbering.
Also searched all their designers, and because of the clear solid glass bottoms I end up with Nils Landberg ??
In that case, the first two could be a capital O and L. I thought the 2nd was a failed 2 because of that wave at the bottom (but that already seemed quite illogical to me).
The O should then stand for Orrefors. Coincidentally, the L looks exactly like the Nils Landberg L, also with that wave at the bottom (in his own signature, Nils Landberg). So in that case there would stand OL 14. 02. or maybe OL 12/. 02 . So the second vase (02) from an edition of 12 vases 12/02 (or 14 vases 14.02) ?
Today I mailed Orrefors with these questions. I already received an email back that it could take a long time because of the holidays, ref.case nr #....... Seems pretty reliable to me. Will let you know.
If it's negative I can already take them out, Val Saint Lambert is now also on that list haha.
Christine you're right about the color, almost all Czech factories are already on that list too.