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<p>[QUOTE=&quot;coinhead63, post: 1409060, member: 28001&quot;]Mint sets of that era contained examples of all circulating coins.&nbsp; The only circulating coin from San Fransisco was the cent.&nbsp; The &quot;black gunk&quot; is not a mint errror but is some contaminant that was on the coin prior to packaging.&nbsp; Many mint sets and proof sets change in appearance over time due to age and/or improper storage.&nbsp; There have been numerous problems with blemished coins from the mint over the years such as carbon spots, &quot;milk spots&quot;, etc.&nbsp; Considering the volume of coins the mint produces just for collectors and the lack of special care in handling coins other than proof, these problems are bound to arise periodically.[/QUOTE]</p><p><br /></p>

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