Originally Posted By: cpm9ball
Medals are cast because they are just too large to be struck. Usually anything in the neighborhood of 100mm is cast. The largest one in my collection that was struck is 81mm.
This year's Olympic/Paralympic Games medals, struck by the London Royal Mint, are 85mm. The striking pressure of 900 tonnes is equivalent to about 992 US tons, or nearly 200,000 pounds!
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Roy