The grading scale stops at 70 is because that is the average IQ of coin dealers.

<< <i>The 1 to 70 grading scale was first devised by Dr. William Sheldon in 1949 in his book "Early American Cents." The numerical scale represented the market value of a common variety 1794 large cent. XFs were worth $40 or $45 depending on how nice they were. VFs were worth anywhere from $20 to $35 depending on whether they were high end or low end VFs.
Some have said that if Sheldon had waited until the 1950s we may have had a 1 to 100 scale. But I knew Dr. Sheldon and I know for a fact that the reason the grading scale stops at 70 is because that is the average IQ of coin dealers.
Thanks.
David >>
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Russ, NCNE
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We'll use our hands and hearts and if we must we'll use our heads.
Go Dave.
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<< <i>I'm not a coin dealer but is an iq of 70 good or bad? >>
Generally speaking, it would qualify a murderer to escape the death penalty.
Russ, NCNE
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<< <i>Here we go>>>>IQ of 70 is GOOD in Arkansas, but BAAAD in Californy >>
That's because California is on the metric system!!
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<< <i>David has a very high opinion of coin dealers ... >>
I found the comment funny (in a self-deprecating humor kind of way) because he is a dealer.
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Mild Mental Retardation
About 85% of persons that are Mental Retarded fall into this group.
IQ level 50-55 up to about 70
Moderate Mental Retardation
About 10% of persons that are Mental Retarded fall into this group.
IQ level 35-40 to 50-55
Sever Mental Retardation
About 3% to 4% of persons that are Mental Retarded fall into this group.
IQ level 20-25 to 35-40
Profound Mental Retardation
About 1% to 2% of persons that are Mental Retarded fall into this group.
IQ level below 20 or 25