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645.5 miligrams is about one-fourth as as a Penny.
In other words, it's 0.26 times the of a Penny, and the of a Penny is 3.8 times that amount.
(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 2,500 miligrams. According to a 2010 report by the United States Mint, the cost of manufacturing and distributing a penny is $0.0179 — more than its face-value.
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