I chose not to pursue buying any of the 1921 because of the costs involved. No comment whether the coin is fake or not, but I would envy anyone who would pay the going rate for this 21D.
HI. I right clicked your scale picture and then opened the picture in a new tab. Then I enlarged the picture to see details. I compared your coin to the 1921-S VF-20 on page 256 of Q. David Bowers "Grading Coins by Photographs" 2nd Edition and it looks similar. My opinion is genuine VF-20.
I still say the first set of images make it look horrible! Glad it straight graded. (You should practice your numismatic photography!)
Hmm leaving the authenticity question aside we all overshot it. But in the slab the grade looks about right, I'd say.
No, I purchase single coins, estates, and coin collections locally. Im about to roll out a platform where others can do the same in other areas and will do a post about it in a week or so.