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<p>[QUOTE=&quot;GDJMSP, post: 2879259, member: 112&quot;]Sandblasting or beadblasting the dies is common. But I have never heard of a coin, not even one, US or otherwise, where the planchets were sandblasted before striking. But polishing the Proof planchets to one degree or another, yeah, that much is a given. </p><p><br /></p><p>Nor have I ever heard of a coin, any coin, that was sandblasted after striking ! Doing that would be downright foolish as it would immediately destroy a great deal of detail on the coin.</p><p><br /></p><p>The one and only thing that determines what type of Proof finish a coin will have, whether it be matte, satin, or brilliant, is the amount of polishing that is done to the dies. You could polish a planchet until it shines like a mirror, then strike it with a die that has a matte finish, and the resulting coin will still have a matte finish. This is because the finish is determined by the way the metal of the planchet flows against the surface of the die.</p><p><br /></p><p>The only reason that Proof planchets are polished is to remove surface planchet flaws before striking. This is only done because it helps prevent any minute defects in the coin.[/QUOTE]</p><p><br /></p>

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