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<p>[QUOTE=&quot;physics-fan3.14, post: 2054076, member: 19165&quot;]iPen - if you ever see the same effect on the mintmark and the date at the same time, it is extremely likely that it is machine doubling. There are DDO&#039;s with RPMs known, but they are very uncommon. This is a function of how the die was created - the hubbing process took place first (where a true doubled die would be formed) and then the mintmark was individually punched into the working die. </p><p><br /></p><p>All of the coins that you posted show machine doubling or post mint damage. </p><p><br /></p><p>As a further note (not just for you, but for many people on these forums) - I highly encourage you to find and read a book about the minting process, learn how doubled dies are created, and what they look like. The number of actual doubled dies posted here is incredibly small, and the number of machine doubled or strike doubled coins posted here is incredibly large.[/QUOTE]</p><p><br /></p>

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