The ones on the sample card (and there is at least another similar card) from the Czech museum does not look Czech to me.
When I first posted it, I did think so, but not so sure anymore. The museum does label them as Czech.

It seems, and I have yet to look into that further, that the crossover between a Czech and a Venetian company has created some beads that were either sold by the Czechs, but made in Venice. Or, made by Venetians, working in Czech.