5 70's large bubble black smoked whiskey glasses

Set of 5 vintage whiskey glasses in designer black smoked glass, large open air bubble in the transparent glass base, possibly from the designer tapio wirkkala finland. Diameter 6.5cm, height 10cm, transparent foot height 2.5cm. Blown glasses with some small imperfections, very good condition, no chips or scratches, not bleached. Weight excluding packaging 2kg. The bubbles have traces of limescale to remove with white vinegar.