Five Czech Tango era spatter glass vases with applied serpentine trails

These five Czech spatter glass vases all feature an applied serpentine trail in cobalt blue.
All measure around 21.5 cm tall & have an integral four cornered footed base. They have various combinations of coloured spatter that is cased over with clear glass.
These are all from my early glass collecting days. I found my first example at a school fete, on the "white elephant" stall when I was still in my late teens. Amongst all the junk, it stood looking at me, & even though I knew nothing about glass at the time, I just knew instinctively that it was something good...& it only cost me $1. I got it home, cleaned off layers of dirt & even found an old, folded up piece of blank paper inside it. Some years later, I saw another one in the window of an antiques shop...it cost somewhat more, but still affordable for an art student. Then, over the following years, a few more examples until I put together this group.