Curious as to what everyone's take on this is. I'm learning and came across this Mint mark on a 1962 D quarter while CRH quarters.
I'm not an expert on RPMs but you can contact John A. Wexler at jwex@comcast.net and get his opinion. He's an expert on doubled dies. Here is his website: https://doubleddie.com/
It does not appear to match any of the known varieties: http://varietyvista.com/09b WQ Vol 2/RPMs 1962-D.htm