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<p>[QUOTE=&quot;physics-fan3.14, post: 3979794, member: 19165&quot;]That&#039;s actually a good question. </p><p><br /></p><p>There are three main things (that I can think of) that could cause a similar look: </p><p><br /></p><p>1. Die rust</p><p>2. Planchet flaw</p><p>3. Environmental damage. </p><p><br /></p><p>The first and most obvious key, rust will have a pimply look. If it is rust on the die, the pimples will be raised on the coin (rust eats into the surface, and causes depressions in the die - low points in a die are high points on a coin). </p><p><br /></p><p>Environmental damage to the coin may have a similar rounded feel, but environmental damage to a coin will usually look sunken into the coin (the corrosion has eaten away at the coin). It may have a similar pimply texture, but it is into the surface of the coin, instead of raised. </p><p><br /></p><p>A planchet flaw (such as a lamination), is generally going to have a streakier nature - rather than discrete bubbles, it will look more like &quot;layers.&quot; </p><p><br /></p><p>On the coin in the first post, it&#039;s interesting that the rust appears to be in a streaky nature, but the pimples are clearly raised. This coin may have been laid on its side and something dripped down its face, causing streaks of rust (purely conjecture).[/QUOTE]</p><p><br /></p>

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