Heading : A large Scandinavian controlled bubble charger
Period : c1970
Origin : Scandinavian
Colour : Light blue with radiating controlled bubbles emanating from the centre
Bowl : Deep central bowl, wide concave rim
Pontil : Polished
Glass Type : Lead 
Size :  Diameter 40.5cm, height 6.5cm
Condition : Excellent, no chips or cracks 
Restoration : None 
Weight:  1755grams 

This has been problematic and we have been unable to attribute a manufacturer.