toughest to grade

I'm interested in the forum's thoughts as to what the toughest coin to grade is. I'm working on the buffalo nickel series in UNC, and I've read this is one of the more challenging series to grade due to the large number of poor stikes.
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SLQs are the easiest ones to me
Look at series' with the least number of collectors, but the existing ones being very entrenched, and this should paint a fairly good composite for you.
I would say the toughest coins to grade are coins that have a strike designation -- at the top of the list of the hardest to grade -- because these coins (in essence) have to get graded twice.
So Mercs with FB, SLQ's with FH, Frankies with FBL, Modern Proofs with CAM/DCAM, Copper with BN, RB, and RD...well you get the idea.
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buffs in slider au to ms
more pre 1915 type coins au58 to ms62
as most all ms61 and 62 coins and many ms 63 coins are only sliders
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The incused design has no raised rim so the fields get immediate wear. Most top tier TPGS MS60-62 are really AU's with wear in the fields.
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But one thing to consider, from my viewpoint:
Except for some Lincoln Cents, I have NEVER seen a more poorly struck coin then some of the Buffalo examples. GAWD.......on some coins the Bison looks like a blob.
Just my humble opinion.....
Pete