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<p>[QUOTE=&quot;Clawcoins, post: 4110833, member: 77814&quot;]in brief,</p><p><br /></p><p>Metal primarily flows outward (excluding the middle which flows up to fill the main image cavity).</p><p><br /></p><p>With the pressure of the outward flow the outer edges of the die wear faster .. thus the reason you see a lot of DDD like this.&nbsp; Remember the mint does NOT CARE about how the coin looks, they are after minting as many as possible, as fast as possible until the die totally dies.&nbsp; They reserve the nice looking stuff, and slower speeds/less die usage for Proof and other sets.</p><p><br /></p><p>The outside of the die also has much lettering too, which gives the metal more area to wear stuff quicker (more edges to wear out) - thus you see oddities in letters and sometimes rebound of the metal/die which creates fake doubling.&nbsp; Since the outside of the die wears faster you start getting partial &quot;rings&quot; forming around the outer edge of the die.</p><p><br /></p><p>In this case you can see the copper plate splitting too.</p><p><br /></p><p>Mike Diamond (several years ago) was investigating Ridge Rings as other world coin examples were creating Ridge Rings under different scenarios.&nbsp; Possibly due to hub/die manufacturing but those examples look kinda different.[/QUOTE]</p><p><br /></p>

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