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<p>[QUOTE=&quot;mlov43, post: 2006914, member: 16729&quot;]Okay.&nbsp; So here are the stats that I have <b>for both varieties, </b> 88/12 and 65/35:</p><p><br /></p><p>The coin is the 1970 10 Won coin [KM-6 and KM-6a]. South Korea (yeah, yeah, I know... my obsession again):</p><p><br /></p><p>Diameter: <b>22.86mm</b></p><p>Width (thickness): <b>1.60mm</b></p><p>Weight: <b>4.06 grams</b>&nbsp; (Krause 2012 World Coin Catalogsays BOTH are <b>4.0600</b>) p.1345 of 39th Edition.</p><p><br /></p><p>The weights are listed as the same(?) to the .01 of a gram (according to the information from the published Korean source that I have). </p><p><br /></p><p>No +/- tolerances noted.&nbsp; These coins were made in the late 1960s and early 70s.</p><p><br /></p><p>+/- tolerances of a hundredth of a gram were not noted on Korean Mint-made coins until 1970 and the introduction of the 100 Won coin, and all of their subsequent coins.</p><p><br /></p><p>The Korean Mint changed metal ratio after spikes in copper prices due to copper mine strikes in the USA in 1967-68. </p><p><br /></p><p>When the TPGs grade these, I&#039;ve &quot;heard&quot; that they only dope-eye the color of these 1970 10 Won coins to type up the BRONZE or BRASS variety on the slab tags.&nbsp; I also heard that they do NOT use specific gravity measurements.</p><p><br /></p><p><b>I would like to know if I could use SG measurements to distinguish the varieties</b>.&nbsp; Is this possible?[/QUOTE]</p><p><br /></p>

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