I always had problems keeping up-to-date with the most sought-after varieties.
Then I ran into the 'set registry' section of PCGS which has any coin with several owner's collections with their ranks in terms of completeness and overall grades.
Virtually all coins have a corresponding color photo to help to ID the irregularity.
Here's an example:
https://www.PCGS.com/setregistry/ni...hedset/57476