Well now you know it's genuine, that's a good thing. One cannot really verify grade without seeing it in hand. At least is wasn't in a body bag. I see much wear on the coin. I don't understand why someone would clean it. It would have been better off left alone. I once owned an 1889 CC that someone tried to clean that clearly started as a choice au that certainly should never have been touched. I submitted it just to make sure it was genuine. Still it made good money, but lost a lot more due to greed. Go figure.
But not only do pocket pieces shoot a hole in the theory, so does pretty much every VF coin there is out there. I cannot think of 1 single VF coin that I have ever seen that did not have equal and even wear on every high point of the coin. Not one. So one of those two things, couple with an ooops on the slab label, seems far more likely to be the real answer here.
I re To make the photo pop out while scroll searching. Its a common practice for those astute enough to think of it
Perhaps what PCGS really meant was that the coin has seen no circulation since it was cleaned. But seriously...,, This is not a seldom seen or rare occurrence with PCGS, especially on net graded world coins they often wildly overgrade on the details portion of the grade knowing that in the market place it doesn't matter anyway (much like it didn't matter in the GC auction).
That slab label doesn't have anything to do with over-grading. It's nothing more than a simple mistake made by a low level employee - the ones who type and print the labels. Just like this one is a mistake - And no that's not some spoof or photoshopped image. I used to own that coin ! And yes they do make screwups like that !
My guess is a simple mechanical error. When I used to watch ebay a lot I would see these "rare" error slabs pop up for a premium. I never saw one sell, but I also never tracked them closely.