first , I really believe that there will be some new undiscovered front/back combos. In most cases we can pretty much predict which ones will appear. This set has rules and we are in the process of figuring them out but there will be rule breakers.
Not long ago everybody thought the apple green Sovereign was just faded ink. Now it has shown us other 350-460 examples we would not have known about.
I know not long ago 3 BL 350s were added to the BL list and a Bush Tolstoi.
Tim you have the Kleinow EPDG listed as Boston-it also exist with New York-I believe this is one of those tough EPDGs-not saying there this is the only one, just tougher than a regular EPDG.
Kleinow.jpg
Kleinowb.jpg