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<p>[QUOTE=&quot;medoraman, post: 2207807, member: 26302&quot;][USER=1844]@Dougsmit[/USER], I believe the correlation of cracks with missing metal on the flan is pretty straightforward. When the coin is struck, there is a radiate force on the metal from the centerpoint of the strike outward. We all see the flow lines. However, if there is a gap in the metal, these forces are allowed to spread open the flan instead of radiate outward evenly. This spread puts pressure on the metal in a straight line towards the center of the force.</p><p>&nbsp;</p><p>Short of PMD, missing metal on the edge of the flan is the main cause of cracks I ever see. If a coin has a partial crack without a visible gap in the metal, in my experience with a glass you will be able to see the metal flaw in most cases.[/QUOTE]</p><p><br /></p>

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