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<p>[QUOTE=&quot;edteach, post: 21086732, member: 85141&quot;]I use a bit of 3in1 oil. then take most of it off leaving a bit to help protect the metal from oxygen. It will not harm the coin and will not leave a residue. I have heard of spraying Lacquer on them or wax. I also have heard about some putting on grapeseed oil and putting them in the oven to bake like sizing a cast iron pan. To me the latter changes the finish so I will give that a pass.[/QUOTE]</p><p><br /></p>

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