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0.680 pounds is about three-fourths as heavy as a Football (American)
In other words, it's 0.75034482758620 times the weight of a Football (American), and the weight of a Football (American) is 1.3327205882350 times that amount.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 0.8750 pounds and 0.93750 pounds. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.
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