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<p>[QUOTE=&quot;Razz, post: 3592363, member: 100526&quot;]So I dont have the 30 years of experience and maybe some one else will chime in with exp in Rockwell Tests. Also I dont have&nbsp; thw coin in hand. But in my opinion, the 90 D looks like a plating blister. And the reason I say that is there ia another one right above it with the black stain around it. Also, the dot is not symmetrical.</p><p><br /></p><p>Starting in 1982 the mint changed the composition of Lincoln cents from copper.zinc alloy to a copper plated zinc Planchet. There has been problems with the copper plating ever since. Sometimes it is fine, and other times there are one or two bubbles of air and sometimes there are numerous gas bubbles of all different shapes.</p><p><br /></p><p>Finally as I breifli mentioned before, the mint has stated that the testing of the die that strikes the coin is not on the face of the die but is on the &quot;neck&quot; of the die. So the indentation on the die face necessary to leave a raised dot on the coin&#039;s obverse or reverse would not be made by the mint and then put into service striking coins. The working life of a die is tens of thousands of strikes, which would leave a dot in the same place on tens of thousands of coins.</p><p><br /></p><p>This is my less than professional opinion and if you can find some references or sources that tell me I am wrong I will admit it and defer to that expert.</p><p><br /></p><p>Good luck![/QUOTE]</p><p><br /></p>

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