I can't tell which error this mint mark has. Maybe neither DD or RPM? Looks like the only part on the coin that is out of place.
It may be a 1978 D WDDO-001 according to wexlers site but i cant see any die markers with those pics. The right leg of the R in TRUST may have some notching but i would check wexlers site and try to see if you can match up the die markers to your coin. http://doubleddie.com/824028.html
Looking at the condition of your Cent with the wear and tear.. I will say the maybe the Mint Mark took a hit. Mint Marks are never Doubled Die, Just RPM meaning Repunched Mint Marks IMHO
You are correct paddyman98 it does not appear to be a RPM and mint marks are never doubled die. I didnt see that Noahstone was only asking specifically about the mint mark and not the entire cent.