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<p>[QUOTE=&quot;Avery G., post: 3447972, member: 102096&quot;]This from CONECA website. &quot;While this paper focuses on Rockwell Tests on planchets, it should be acknowledged that Rockwell Tests are also performed on dies and on master hubs. “A die that is too hard will be brittle and have a tendency to fail prematurely. A die that is too soft will deform and deteriorate too quickly.” (Diamond, Page 16) A die which has had a Rockwell Test will leave a raised bump on the coin. This same source shows a photo of a 2000 Lincoln Cent with a small, circular indentation just above Lincoln’s bow tie. It has been proposed that this is from a Rockwell Test on a Master Hub since the same mark can be seen in preceding and subsequent years without change in position. However, it should be noted that neither such a circular indentation from a Test on a Master Hub nor a raised bump from a Test on a Die will leave a “mirror image” of the indentations on planchets being discussed here. The shapes of these indentations will be different. (See a discussion of this in Appendix A).</p><p><br /></p><p>Planchets with Rockwell Test Marks are very rare to extremely rare. (Harper and Miller, Page 62.) “Dies and planchets tested in this fashion are supposed to be discarded, since they are blemished once the procedure is completed. If they are not discarded, then you have a desirable die error and planchet error, respectively.” (Diamond, Page 16)</p><p><br /></p><p>There is a notable lack of consensus in the Numismatic Community over whether there are actually any legitimate Rockwell Test Marks on coins. Absolute certainty requires that the test itself be witnessed and the planchet followed through the complete minting process![/QUOTE]</p><p><br /></p>

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