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<p>[QUOTE=&quot;Pete Apple, post: 26559512, member: 103982&quot;]Very well stated! We seem to be focusing on features today that, in many instances, are smaller than my calipers are able to measure! That means less than 10µ! </p><p><br /></p><p>In addition, we do not have universally accepted definitions of what MMD and WHD look like, so working with current attributions is an exercise in futility.</p><p><br /></p><p>As an example, an attempt to apply the metric that Working Hub Doubling has the appearance of strike doubling can be helpful, <u>except</u> in cases where it does not quite apply.</p><p>&nbsp;</p><p>Example: the following is (tentatively) attributed as WHD:</p><p>[ATTACH=full]1692428[/ATTACH]</p><p>This does not look like strike doubling to me! </p><p>So, either the diagnostic or the attribution is wrong or I am wrong about its appearance.</p><p>For the diagnostics to be correct, I suppose this could be Master Die Doubling. That means at least 2 Master Dies for these issues. Maybe my math and assumptions are wrong (see below), but I am not convinced there were 2 Master Dies for issues of this size.</p><p><br /></p><p>If I could bring some consistency to this discussion, I would - - but, at the present time, it escapes me!</p><p>&nbsp;</p><p><b>I have attempted to estimate numbers of hubs/dies. The mint asserts that an average of 500,000 coins per die is acceptable and is realistic. I own one die that was retired after 109 strikes, and I have retirement records of other dies with the largest number of strikes before retirement of 3,680,690. </b></p><p><br /></p><p><b>Using the mint’s guidance of 500,000 coins per die, the highest number of State Quarters produced was 943,000,000, for which 1,886 dies would be required. Assuming one Working Hub can produce 100 dies, 19 working hubs would be required. I have no doubt that one Master Die can produce 19 working hubs.</b></p><p><br /></p><p><b>For coins with larger minting numbers, for example the 2019 Cent which has been attributed as having Master Die Doubling, the mintage was 3,542,800,000 at the Philadelphia Mint. It is likely that 4 or 5 Master Dies were required. A hint of different Master Dies may be seen by comparing a few Random Photos (Images Courtesy of Professional Coin Grading Service [PCGS.com]) as seen below. </b></p><p><b><br /></b></p><p><b>[ATTACH=full]1692429[/ATTACH]</b></p><p><b></b>[/QUOTE]</p><p><br /></p>

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