Czech vase - black with red

Czechoslovakian glass vase with a bulbous top and a narrow waist stands 7" (17.8 cm) tall featuring a red on black smoke trail decor - an interesting decor that looks different on every side. This is a recognized Kralik shape and the decor is similar to other Kralik decors. Looking straight down onto the underside, the mark is essentially invisible, but a slight tilt reveals a straight-line "Czechoslovakia" acid-stamped mark that has also had a case made that it is a Kralik mark. I'm thinking there is a pretty good chance that this was made by Kralik.