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<p>[QUOTE=&quot;cpm9ball, post: 2659702, member: 24633&quot;]I think you&#039;ve overthought the calculation. If your calculation was accurate, then you should be able to multiply the length of the unstruck portion by 11 to arrive at the diameter of the coin. I think you will find that this measurement will be considerably larger than the diameter of a quarter. Granted, the coin is slightly ovoid, but it is still not as large as your estimate of a 9% O/C strike.</p><p><br /></p><p>My calculation of a 20% O/C (+ or -) is based on the fact that the length of the unstruck portion is about 1/5th of the length of the struck portion.</p><p><br /></p><p>Chris[/QUOTE]</p><p><br /></p>

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