That's interesting ...
Having looked again at the Skrdlovice pattern books, there is a 1983 design by Palecek (8318/34) which is pink with spiral mica patterns, but the top is shown as colourless in the drawing (not pink). As the others in the series are amber/green it suggests the colour change might be typical of this design. Not like mine. No dimensions in the pattern book, so there's no clue there ...