Hello Max!
I looked your vase in some reference books I have and I knew I had seen it before... I have almost the same vase listed as a Blenko piece, (from catalogue photos!), in Lesslie Piña's "Circa Fifties Glass" Book.
There are 2 images where it apprears (in 3 different shapes). The item numbers in the catalogue are #5935, 5940, and 595.
Actually, let me back up a bit and say that the pieces in the catalogue have the same color round decoration applied to them. I am not sure if your vase is a variation with a different color added, or maybe a vase taken after a Blenko piece/style.
Hope this helps!
Javier