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[i]According to Worden, the actual ingot of silver was flown and no medals were struck from it prior to the mission. In this case, that would mean that any original medals did not contain treasure silver and were purely made from regular sterling stock. When Apollo 15 returned to Earth, the ingot was sent to Robbins, who had it melted and added to a melt of unflown sterling silver to create a special melt. The newly struck and corrected Apollo 15 medals, numbers 128-304, were then struck from this new melt. ...Al Worden suggests that the silver ingot that he flew weighed approximately 2.2 ounces. When one computes that an average Apollo 15 Robbins medal weighs approximately 20 grams, or approximately .70 of an ounce, we can see that the 177 unflown Apollo 15 Robbins medals contain only a small amount of treasure silver, approximately 1.76%.[/i]
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