Slazenger Challenge 4-Star
Challenge 4-Star was a football made by the British company Slazenger as the official match ball for the 1966 FIFA World Cup held in England, one of the countries inside the United Kingdom. The ball was made with 25 rectangular panels and had no markings or branding.
It was selected in a blind test at the Football Association headquarters in Soho Square.

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FIFA World Cup balls
1966 FIFA World Cup
Slazenger