Can't really pin it down to a time period. I think the Murano designs inspiring this style must have been early to mid 50s at the latest to influence the designs for Scandinavian, Czech, French, Belgian etc factories in the late 50s to 60s/70s.
If I recall correctly, the Czech and Flygsfors started to look like that in the late fifties, and I have never found a good source to date the French and/or Belgian pieces, but I know that Bayel (France) and Boussu (Belgium) did have that sort of style in their production (never seen a catalogue of these factories, sadly).
Astrid