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<p>[QUOTE=&quot;-jeffB, post: 2787935, member: 27832&quot;]Hmm. I&#039;ve blown the &quot;wear takes off metal&quot; trumpet here for a long time, but even my slickest Barber half probably hasn&#039;t lost as much as 10% of its weight.</p><p><br /></p><p>Out of the thousands of Kennedy halves I&#039;ve handled, I could count the sub-XF examples on the fingers of one hand. That means they&#039;ve lost scant milligrams of weight due to circulation; that&#039;s probably one reason 1964 Kennedys often trade at a premium over other forms of 90% junk silver.</p><p><br /></p><p>If you assume all the wear comes off the 80% layer (almost certainly true), it just means the proportion of silver lost is twice what you&#039;d measure on a 90% coin. (Taking off 10% of the weight of a 40% Kennedy would take 20% of the silver; taking off 10% of the weight of a 90% coin would take 10% of the silver.) Since you&#039;re losing probably well under .1% of the coin&#039;s weight at these wear levels, you&#039;re still ahead of the typical circulated 90% junk.[/QUOTE]</p><p><br /></p>

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