1968 D penny. Could this be an RPM?

I came across this penny which seems to have a much thicker D than other pennies. I know there is a 1968 D RPM in the cerrypickers guide, but I don't really see any doubling on the mint mark here. I was just wondering what you guys think.

 

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I think the circulation damage may have ruined the chances of being able
tell if it is an RPM. Have you compared to these?
http://www.varietyvista.com/02b LC RPMs Vol 2/RPMs 1968D.htm

 

It looks like it took a hit somewhere along the way. PMD to me.

 

PMD (Post Mint Damage) IMO. Looks like the D took a hit.