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<p>[QUOTE=&quot;Goodies, post: 717224, member: 21156&quot;]hi,</p><p><br /></p><p>I&#039;m new here, I hope I understood the question correctly.</p><p><br /></p><p>There are some differences between mechanicly caused doubling (called &#039;&#039;double strike&#039;&#039;) and die-originated doubling that can be looked into without having the coin at hand...</p><p><br /></p><p>1 - Is it mensioned in literature ? real doubled dies occur in (sometimes many) identical examples because there was 1 die and many coins. A mechanical doubling (double strike) will never reproduce precisely</p><p><br /></p><p>2 -&nbsp; Double strike always results in wiping out details from the first strike, a doubled die is doubled in the deeper parts of the die, so it will result in double lines. It leaves the first strike intact.</p><p><br /></p><p>3 - A mechanical doubling can be heavily off-center, a doubled die is mounted into a well-centered chuck, which allows only distortions in the angular direction.</p><p><br /></p><p>This is an example of doubled die:</p><p><br /></p><p><img src="http://upload.wikimedia.org/wikipedia/en/thumb/a/a3/Doubledate.jpg/200px-Doubledate.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>As you see, a complete second year is visible. When this doubling would have been caused by double strike, the first year would be partially wiped out. The second strike occurs at the same diameter (angular shift only)</p><p><br /></p><p>This is an example of double strike:</p><p><br /></p><p><img src="http://www.jimscoins.com/images/double_strike_3_w_wt.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>As you see, the second stroke is heavily decentered and completely occluding the first stroke, <i>especially</i> in the flat parts ! With a doubled die that would not happen, because the concave parts of the die will be done twice with a small deviation (in position)</p><p><br /></p><p>Kind regards,</p><p><br /></p><p>LxGoodies[/QUOTE]</p><p><br /></p>

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