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<p>[QUOTE=&quot;messydesk, post: 26051240, member: 1765&quot;]When a mint mark is punched into a die, it pushes the metal displaced by the punch aside, resulting in a slightly raised field on the die around the mint mark.&nbsp; If the punch is stronger, then more metal is displaced.&nbsp; If this isn&#039;t polished down later before the die is used, the resulting coins will have a slight trough around the mint mark.&nbsp; 32-D quarters are notorious for this appearance.&nbsp; </p><p><br /></p><p>This raised bit around the mint mark, even if slight, also explains why machine doubling can show up on the mint mark without showing up elsewhere.&nbsp; The first contact between die and struck coin will be where the high point on the die hits the edge of a raised part of the coin.[/QUOTE]</p><p><br /></p>

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