Czechoslovakia in-mold relief mark

In the last year or so, I have seen more items with a CZECHOSLOVAKIA in-mold relief mark than I have seen in the previous thirty. This vase is 6 1/2" (16.4 cm) tall with bottom-up spatter on a transparent cobalt ground with a simple, unspectacular shape. It is exactly the same size and shape as the piece with the light blue base in the fourth picture. The other pieces in the collage (with the possible exception of the cigarette holder) are shapes that don't seem to coincide with any published interwar shapes. It makes me curious about when this sort of mark was used. I'm hoping someone has some ideas to add.