What's the most difficult US coin to grade in mint state?

As we all know, the differences between a point can be minute and subjective, though with big bucks on the line. So what's the most difficult series to tell the differences to grade in mint state?
Early American Copper, Bust and Seated.
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Indian Head half eagles and quarter eagles. The incuse design makes grading more challenging for me. There are also lots of counterfeits.
RMR: 'Wer, wenn ich schriee, hörte mich denn aus der Engel Ordnungen?'
CJ: 'No one!' [Ain't no angels in the coin biz]
Capped Bust Halves.
"Seu cabra da peste,
"Sou Mangueira......."
Indians----incused . I also have a hard time with buffalos.
The Standing Liberty Quarter seems to be up there. Between the weak strikes and the often missed rub on the knee, I've seen a fair number of Mint State graded pieces I'd call "sliders."
Yes, and also the quarter eagles
Some Buffalos are weak struck and are a bit taught to grade some will sell as AU and they are MS65's.
Hoard the keys.
According to most dealers, any coin I want to buy
I'd go with all draped bust silver.....as 80-95% of the coins graded mint state all have rub and minimal luster in the 61-62 grades. They'd grade XF/AU if they were Morgan dollars. If that doesn't make it hard I don't know what does. But right behind those are the capped bust halves.
I struggle with Buffalo Nickels and Mercury Dimes.
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My Full Walker Registry Set (1916-1947):
https://www.ngccoin.com/registry/competitive-sets/16292/
1815 Large Cent
$2.5 and $5 Indian gold.
Give me a round disk of metal and I can grade it.
Any coin, any series,any country.
Whether anyone will agree or not...that's a different deal.
Buffalo nickels seem tricky.
By far Washington quarters are tough for me
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Peace dollar
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I join in the majority... incused Indians.
1792 Birch Cent
Successful BST deals with mustangt and jesbroken. Now EVERYTHING is for sale.
Yes.
1933 $20 gold.
In all seriousness, buffalo nickels.
Every date and mint, need to be treated as individuals.
I find SLQ's to be tricky... not the reverse though....Also, it has not been a series that has really interested me, so likely I have not spent much time looking at them. Cheers, RickO
I'm with the incuse Indians.
Oh yeah, also CC Morgan's that have seemingly transcended type in their consideration.
14 scrapes, dings, and hits? 65 then.

Buffalo Nickels are a challenge for me. Indian head eagles (incuse) are nearly impossible for me.
Washington quarters, hands down.
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Peace $ especially SF issues... some look AU but are just very weakly struck.
SL Quarters.
So many MS 65's and better with no full heads...so many lower grades with full heads. The point is the strike is highly variable, and polishing affects a lot of the intricate detail.
"Just because you were born on 3rd base doesn't mean you hit a triple"
$2-1/2 and $5 Indian gold are easy if you take the time to learn. Most just glance at them at shows and never really learn. Field luster is the key.
This.
DPOTD-3
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Don
1892-o Morgan Dollar.
bob