I can't add anything about doubling on incuse devices but, yours is an ATB (America the Beautiful) quarter and not a 50 States (or Statehood) quarter. I hope that helps in some way.
In Memory of Crazyb0 12-26-1951 to 7-27-2020 In Memory of Tootallious 3-31-1964 to 4-15-2020 In Memory of T-BOP 10-12-1949 to 1-19-2024
MD is very common on these incuse devices. About 70% are affected. Some minor and some stronger. But they are not doubled dies on the outside lettering. The reverse doubled dies are confined to the center area of the designs.
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