Are my eyes playing tricks on me? (1921 Mercury Dime)

Or do I see a very faint D?



Also, as I am not very experienced with this series I'd enjoy hearing opinions on this coin's grade. I'm thinking AG3 but I'm curious if anybody thinks it's strong enough to be G4 and if so, why.



Also, as I am not very experienced with this series I'd enjoy hearing opinions on this coin's grade. I'm thinking AG3 but I'm curious if anybody thinks it's strong enough to be G4 and if so, why.
"YOU SUCK!" Awarded by nankraut/renomedphys 6/13/13 - MadMarty dissents
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Comments
I bought this as a 21P and it was dirt cheap, so I'm not invested in the idea of it being a D. I just saw a little curve that caught my eye.
I wouldn't commit to saying without seeing it in hand. My best guess is something is just going on in that area.
President, Racine Numismatic Society 2013-2014; Variety Resource Dimes; See 6/8/12 CDN for my article on Winged Liberty Dimes; Ebay
1921 d
President, Racine Numismatic Society 2013-2014; Variety Resource Dimes; See 6/8/12 CDN for my article on Winged Liberty Dimes; Ebay
fcloud, I see what you mean about the eBay merc. That coin is actually a bit more beat up than mine and the mint mark is still pretty plain to see. I don't know what I'm seeing here. i suppose it's possible that there is just some coincidental weirdness on this Philly coin right where a D mint mark would be. Obviously, in this grade it doesn't make much of a difference either way.
President, Racine Numismatic Society 2013-2014; Variety Resource Dimes; See 6/8/12 CDN for my article on Winged Liberty Dimes; Ebay
Thanks for your input everybody.