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<p>[QUOTE=&quot;Hobo, post: 1744170, member: 11521&quot;]A specific gravity test would determine if the coin is platinum. You will need an accurate scale (one that can weigh to the nearest 0.01 gram). Very simply you will weigh the coin normally and weigh the coin suspended in water and then do some calculations. Search the threads here for more details on how to do a SG test.[/QUOTE]</p><p><br /></p>

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