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454.960 pennyweights is about one-and-seven-tenths times as heavy as a Football (American).
In other words, it's 1.7212279802960 times the weight of a Football (American), and the weight of a Football (American) is 0.58098056239360 times that amount.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 255.20833333330 pennyweights and 273.43750 pennyweights. 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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