Tall blue carnation vase - marked Czechoslovakia

I couldn't resist starting with a photo emphasizing the size difference between this vase and my previous post.
In the pottery world, we call this shape a carnation vase - I'm hoping it's the same for glass. Anyway, the vase is 11 3/16" (23.3 cm) tall with a diameter of 4 1/4" (10.8 cm) at the top and bottom. It is a simple, unadorned transparent blue that is possibly most interesting for the mark on its underside which serves as a reminder that there are considerably more marks than can be accounted for.