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<p>[QUOTE=&quot;-jeffB, post: 3012934, member: 27832&quot;]Short answer: <b>yes</b>.</p><p><br /></p><p>As I understand it, when you strike a coin, the metal that flows into the devices -- the profile, the lettering, and so on -- undergoes <i>work hardening</i>, where its bonding structure changes, making it harder <i>and more resistant to chemical attack</i>. That&#039;s why you can restore dates on dateless nickels.</p><p><br /></p><p>I think this effect is fairly strong for copper and copper-nickel alloys, but very weak for silver, and practically non-existent for gold. That&#039;s why it&#039;s difficult or impossible to restore dates on silver. (I&#039;ve never come across dateless gold, and probably never will.)[/QUOTE]</p><p><br /></p>

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