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<p>[QUOTE=&quot;Conder101, post: 2133407, member: 66&quot;]SG for Jefferson nickel is 8.92 (CuNi) or 9.25 (war&nbsp; nickel)</p><p>Silver Kennedy is 9.53 for 40% or 10.34 for 90%</p><p><br /></p><p>SG doesn&#039;t depend on size or denomination or condition, it depends on composition.&nbsp; So all of the 90% silver coins will be 10.34, all the 40% silver will be 9.53, all US CuNi clad coins are 8.92, all Zincolns are 7.17 etc.</p><p><br /></p><p>If you know what the composition of a coin is supposed to be you can calculate it&#039;s SG pretty closely, it is the sum of the percentages of each element times the SG for that element.&nbsp; For example a 1945 wheat cent is 95% copper and 5% zinc&nbsp; so the SG=(.95*8.96)+(.05*7.133) or 8.51+.357 = 8.86&nbsp; The table I have says 8.83&nbsp; The calculation helps for those world coins that you don&#039;t have a chart for.&nbsp; (Conversely if you don&#039;t know the precise composition the actual SG can help you determine what the composition could be.)</p><p><br /></p><p>If you really want a table of the specs for US coins, get a copy of the Coin World Almanac.&nbsp; You can pick up a used copy on Abebooks for under $5 including shipping.&nbsp; It will give you the table you want and a tremendous amount of other information.&nbsp; (Frankly everyone like to push the Redbook, but it is mostly a book full of meaningless prices and some good information.&nbsp; The CW Almanac doesn&#039;t have the meaningless prices but it does have a lot more info.&nbsp; I would MUCH rather give up my Redbook than I would my Almanac, and the Almanac is cheaper.)[/QUOTE]</p><p><br /></p>

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