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<p>[QUOTE=&quot;SF11Dude, post: 2677434, member: 84865&quot;]Had to look up the &quot;Blakesley Effect&quot;; thanks for pointing that out. Below is a link that is a fantastic article on it with pictures!</p><p><br /></p><p>Between blanking and striking several steps occur, which may include (based on the metal, era, mint, and intended product) annealing, washing, polishing, and rimming. It is this last which is of interest in the incomplete planchet error. To rim a blank, the blank is fed into the upset mill which contains a specially shaped groove. Placing pressure on both sides of the coin pushes and raises the rims – the same idea is used to “spoon” a coin. However, on an incomplete planchet, the coin is not round. Pressure cannot be properly applied at the missing area – which means the rim directly opposite is also not formed properly. This is known as the “Blakesley Effect,” named after the numismatist who first studied the phenomenon. After upsetting, the planchet travels to the coining room and is struck.</p><p><br /></p><p><a href="http://board.conecaonline.org/showthread.php?2600-What-You-Need-to-Know-about-the-Incomplete-Planchet-Error" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://board.conecaonline.org/showthread.php?2600-What-You-Need-to-Know-about-the-Incomplete-Planchet-Error" rel="nofollow">http://board.conecaonline.org/showthread.php?2600-What-You-Need-to-Know-about-the-Incomplete-Planchet-Error</a>[/QUOTE]</p><p><br /></p>

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