From Pele’s Telstar in 1970 to the Jabulani for South Africa 2010, the History of the Ball:

The first one of these that I owned was the Tango from 1978 - that was Mario Kempes‘ World Cup.
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I think that the fist ball not to gain too much weight when getting wet was the Telstar 1974. That was my first ball. Cruyff's World Cup....
I never read about 1970 to 98 balls, i just knew from 2002 to 2010.
Thanks to share