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<p>[QUOTE=&quot;Sallent, post: 3582810, member: 76194&quot;]Die rust happens. It&#039;s not uncommon to see an occasional bump/pearl or two on a genuine coin. So how can you tell of cast or not? There need to be at least another of these flags such as underweight/overweight out of specs, soapy legends, unatural weakness (lack of detail in the portrait/design that seems unatural given the level of wear), or polished rim/ cast line running across rim. Another diagnostic from the rim area is an edge crack that is substantial enough that it should be running across the rim, but somehow doesn&#039;t and just dies at the rim (as if it&#039;s been filled up ).</p><p><br /></p><p>Here&#039;s an example of genuine bumb/pearl caused by die rust.</p><p><br /></p><p>[ATTACH=full]956118[/ATTACH]</p><p>To the left of Asclepius (right next to his face) you see an unatural raised area. Now you could say cast because of that....but it is really die rust. The coin is in the right range of weight/diameter, the legends are sharp, design is sharp and looks struck, the rim has a crack going all the way through it and no signs of any polishing or gate marks, etc.</p><p><br /></p><p>It is not uncommon also to find genuine coins with pitted surfaces due to corrosion. But that is different from bubbles in the mold of a cast. if you can&#039;t tell the difference by looking at a photo then I suggest you get an electron microscope and look under 20x magnification. The difference between naturally occurring corrosion and something nefarious will be obvious to you once you look at two or three examples of each. Corrosion is very irregular in appearance, while the bubbles of a cast will be very uniform/smooth in appearance.[/QUOTE]</p><p><br /></p>

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