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<p>[QUOTE=&quot;Earle42, post: 2492480, member: 78261&quot;]OK kids (sorry - former math teacher) let&#039;s do the math:</p><p>From the link here:</p><p><a href="https://www.cointalk.com/threads/national-bicentennial-medal.216522/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/national-bicentennial-medal.216522/">https://www.cointalk.com/threads/national-bicentennial-medal.216522/</a></p><p><br /></p><p>and the above pics we see the closest match from this list to the above pics is the </p><p>- 1-5/16&quot; / Gold, Proof finish / 1.167 troy ounces of gold / $400.00</p><p><br /></p><p>Let&#039;s see what a medal of pure gold of same dimensions should weigh.</p><p>1.&nbsp; We don;t know the exact thickness (which is needed) but can estimate.</p><p>2.&nbsp; The pics seem to show a 1 5/16 &quot; match for diameter = 1.3125&quot; </p><p>3.&nbsp; Therefore radius = .65625</p><p>4.&nbsp; Volume of a circular, cylindrical surface in simplisitc form is its height time pi times its radius squared.</p><p>5.&nbsp; The pics seem to indicate a thickness of just under 1/8th inch. So lets use a full 1/8th (.125) and also half of that (.0625) and see if the pic of the coin&#039;s weight on the scales is somewhere in between.</p><p>For the .125 (1/8) thickness we get:</p><p>Height (thickness in this case) X 3.14 X Radius^2 (which means radius times radius)</p><p><br /></p><p>.125 X 3.14 X .6525^2 = .1671 cubic inches of gold</p><p><br /></p><p>The thinner calculation:</p><p>0.625 X 3.14 X .6525^2 = .0836 cubic inches of gold</p><p><br /></p><p>according to:</p><p><a href="http://www.aqua-calc.com/calculate/volume-to-weight" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.aqua-calc.com/calculate/volume-to-weight" rel="nofollow">http://www.aqua-calc.com/calculate/volume-to-weight</a></p><p><br /></p><p>The first calculation gives a weight of 1.87 oz</p><p><br /></p><p>The thinner calculation gives: .93 oz</p><p><br /></p><p>The pic of the coin on the scales fits between these two - and is actually closer to the thicker one where we already know the thickness is not quite 1/8.</p><p><br /></p><p>If I had to make an educated guess, I would say the coin is gold.</p><p><br /></p><p>Please correct any errors for me in the above.[/QUOTE]</p><p><br /></p>

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