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<p>[QUOTE=&quot;physics-fan3.14, post: 2754564, member: 19165&quot;]The biggest reason you don&#039;t see 60 and 61 on many series is because it just isn&#039;t worth it. The people who are submitting (usually) know how to grade, and won&#039;t send something in that is that close to a problem coin.</p><p><br /></p><p>Now, this all changes when you have a tough series or a rare date. You&#039;ll see a lot more 60s and 61s on rare date $20 Libs than on common date Morgans - because it is worth it.</p><p><br /></p><p>So, I guess you could call it &quot;selection bias&quot;. When the grade is warranted, the grade is given.[/QUOTE]</p><p><br /></p>

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