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<p>[QUOTE=&quot;Oldhoopster, post: 3514034, member: 84179&quot;]1973 Proof coins were minted in San Francisco.&nbsp; I don’t see an S mm on your pictures (but hard to tell with your pics).&nbsp; If there’s no mm, it’s a Business strike from Philadelphia.</p><p><br /></p><p>It’s not a good idea to store it in a plastic bag.&nbsp; There could be interactions between the plastic and coin surface.&nbsp; I can’t say if this caused the white spot, but it certainly doesn’t help[/QUOTE]</p><p><br /></p>

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