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142 monme (匁) is about one-and-three-tenths times as heavy as a Football (American).
In other words, it's 1.2954058440110 times the weight of a Football (American), and the weight of a Football (American) is 0.7719588456570 times that amount.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 105.83821966670 monme (匁) and 113.39809250 monme (匁). 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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