Is 489.450 monme (匁) as heavy as a Football (Soccer Ball)?
It's about four-and-a-half times as heavy as a Football (Soccer Ball)
The weight of a Football (Soccer Ball) is about 110 monme (匁).
(a.k.a. Soccer, a.k.a. Association Football) (FIFA Law 2 specification)
According to FIFA's Law of the Game number 2, a football must weigh between 110 monme (匁) and 120 monme (匁). An artifact on display at the Smith Art Gallery and Museum in Stirling, Scotland is said to be the world's oldest football and is about one-third to one-half the size of a modern football.
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