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<p>[QUOTE=&quot;desertgem, post: 3097234, member: 15199&quot;]The eye has a very hard time measuring small differences in thickness without a mm ruler or similar. Same is true with diameter. If you can find a mm ruler, try to get an accurate measurement</p><p>of both. Did you calibrate the balance with other cents?&nbsp; I strongly suspect acid action on a worn cent without more measurement accuracy. Thanks, Jim[/QUOTE]</p><p><br /></p>

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