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<p>[QUOTE=&quot;gianni, post: 3585187, member: 100339&quot;]Coin parameters diameter 30.60mm x 2.15 thickness 90% silver 10% copper weight 12.50grams.</p><p>The specific weight of 90% silver (10.49kg / m3) is higher than the weight of copper / nickel 10% (8.9kg / m3). In proportion this means that the coins with a weight of 12.68 grams CONTAIN MORE SILVER OF 90% official and exactly are of the 925/1000. It is not known what caused this error in the composition of some batches of 1964 and which contained 925 of silver 75 of copper. Hard to say whether to consider these pieces of SMS or give them another name variant 50C 1964 Kennedy OW (over weight).[/QUOTE]</p><p><br /></p>

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