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<p>[QUOTE=&quot;cpm9ball, post: 3798812, member: 24633&quot;]What do you mean by &quot;usual surface&quot;? </p><p><br /></p><p>Technically speaking, it is more accurate to say that the coin was produced by a grease-filled die. As grease and particles of dust or debris build up in the recess of the die, in this case it is the digit &quot;9&quot;, continued striking of new planchets causes the &quot;concoction&quot; to become compacted until it completely fills the void. At this point, the recess in the die disappears, and since the space formerly occupied by this digit is relatively small, you can hardly tell that it was even there unless you can examine the area on the coin with a very high-powered microscope.</p><p><br /></p><p>Chris[/QUOTE]</p><p><br /></p>

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