I thought I had posted this a while back but cant for the life of me find it if I did. Do you see an RPM here or did the D just take a hit? The other thing that seems odd to me...is that if this were a 1932 I'd be saying the mint mark was glued or soldered on and fake...its got crud all the way around it.
You may want to have a look at the cpg as the 1952 D quarter has what is called a huge Mint mark . It is the only coin and date known to have 3 different size mm.