1921 morgan under grade?

Normally, I would not send in a 1921 Morgan to get graded by itself but I had a very large submission to pcgs. I felt since my average cost per coin for grading was low so I picked what I thought would be a ms 1921 Morgan.
According to pcgs I was wrong and this coin was graded AU58.
I was right with nine other Morgan’s I sent in with this coin being graded minimum ms62.
I am smart enough to know that I don’t know everything (by a long shot) therefore, What did I miss here?
Thank you in advance for your comments.
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Comments
There looks to be rub on Liberty's cheek and her upper right cap area, so AU58 looks correct to me.
Mark Feld* of Heritage Auctions*Unless otherwise noted, my posts here represent my personal opinions.
I agree with @MFeld.... AU looks fair. Cheers, RickO
There is wear on the high points of both the obverse and reverse. AU is correct.
Is that luster break we are seeing? I concur with others. AU is the right grade for this piece.
Great spirits have always encountered violent opposition from mediocre minds.-Albert Einstein
Thank you for your observations and comments.
I find when I get coins graded sometimes I win and sometimes, like this one, I lose. Overall the good news is I have a high win percentage.
But now someone can use it in their Everyman set where it is a high grade rather than being a low grade MS coin that no one really wants.
Mr_Spud
I am nowhere a grader of Morgans.
I can see the wear / rub spots mentioned above.
To me the reverse rim shows some "nicks".
Would this be a part of the coin's grade determination?
Wayne
Kennedys are my quest...
Many uncirculated coins exhibit rim nicks. That said, looking at the rims can sometimes provide a clue/piece of the puzzle as to whether a given coin is uncirculated.
Mark Feld* of Heritage Auctions*Unless otherwise noted, my posts here represent my personal opinions.
Thanks
Wayne
Kennedys are my quest...
You are paying for your education the hard way. Perhaps a grading course would help?
Everyone agreeing that the coin is AU. Is anyone surprised that it is graded AU58? It doesn't look that "choice".
I don't really see a rub on either cheek nor cap. But then that's my eyes. I do feel there might be slight wear on the Eagles upper breast. That would be reason enought for an AU58. Not sure but just an opinion.
Jim
When a man who is honestly mistaken hears the truth, he will either quit being mistaken or cease to be honest....Abraham Lincoln
Patriotism is supporting your country all the time, and your government when it deserves it.....Mark Twain
I think the photo above shows the issue. Can see why they graded it AU. The cheek was first thing made me think it’s AU but the lt wear on Rev Eagles Breast likely a factor in the PCGS grade too.
Again, great photos.
Wayne
Kennedys are my quest...