Why are Peace Dollars so hard to grade???

I can't figure it out? Morgans, jump off the page to me.
Peace, I am looking at a cleaned, an altered surface, and a 64. I am sorry. They all look the same!!!
I might as well melt them all right? (Outside of the few rare ones I own of course.)
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Comments
President, Racine Numismatic Society 2013-2014; Variety Resource Dimes; See 6/8/12 CDN for my article on Winged Liberty Dimes; Ebay
First, the bad strikes on most examples. If you aren't used to it, a weakly struck design can be mistaken for wear.
Second, the Peace Dollar obverse, more than any other dollar, draws attention to the very center of the coin. There is something special about Liberty's face on this series. She really is pretty. Her cheek and slightly parted lips bring attention to that point, which makes it easier to ignore other marks.
Third, the reverse is PARTICULARLY mushy, and has a lot of places in the rays that small tics in the surface can hide.
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<< <i>I think it has to do with the washed out strikes. Alway mushy and many look worn out just as struck. >>
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"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
<< <i>When I select one for a type set, what date(s)/mint would you recommend for the best strike? Is it better to attempt to find a nice 1921 high relief example? >>
If you are going for all of the types, the 1921 Peace dollar is a one year type by itself.
For a type coin, I'd look for one where the lettering on the reverse is sharp and clear.
Otherwise, grading BU coins from MS63 - MS67 is quite easy, as are lesser circulated coins.
<< <i>I hear you. I sent in one or 2 that I thought would grade unc that were untoned with decent luster. They came back "cleaned". I couldn't figure it out either so I don't even try grading Peace dollars any more until maybe the light bulb goes on and I see what they are seing. >>
I bought a 1928-P that was sold at auction. Looked every bit as good as my 64. Much brighter as well. Anyway, comes back PCGS 58. I'm like, NO WAY!
So I bust it out and send it to NGC, comes back in a bag "PVC"!!!!!!!! There is no way PCGS misses the plastic. I sure don't see it either!
I give up on these things!
Here is the proof! How's that for a nice crackout upgrade?? If I send it to ICG, she might come back as a "FAKE" HAHAHAHA!