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1992 D 1c die clash and Rockwell test mark?
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<p>[QUOTE="Kevin Mader, post: 6586712, member: 106826"]When I read about this (hardness test), it frankly didn't make sense to me having done hardness testing in a past life and being around stamping/coining operations for 30 years. The malleable nature of copper under that kind of tonnage essentially liquifies the outer layer of planchet. The likelihood of a penetrator mark surviving seems extremely unlikely. The folks at the mint might have personal experience with this that refutes thought, but on the coining operations I've been around...not a chance. I will check out your paper later. Thanks for the input/history.[/QUOTE]</p><p><br /></p>
[QUOTE="Kevin Mader, post: 6586712, member: 106826"]When I read about this (hardness test), it frankly didn't make sense to me having done hardness testing in a past life and being around stamping/coining operations for 30 years. The malleable nature of copper under that kind of tonnage essentially liquifies the outer layer of planchet. The likelihood of a penetrator mark surviving seems extremely unlikely. The folks at the mint might have personal experience with this that refutes thought, but on the coining operations I've been around...not a chance. I will check out your paper later. Thanks for the input/history.[/QUOTE]
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1992 D 1c die clash and Rockwell test mark?
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