I recently bought a Superbird 1952 Proof Washington quarter. Its in an Unattributed NGC slab, but the S is there. It is pretty difficult to photograph since it is small and does not stand out in relief well. PF 64.
It is believed a mint worker etched the proof die to create the "S". Attributed as FS-901. A greater rarity is to find a FS-902 superbird with reworked tail feathers. Both are only found in the proof 1952 quarter.
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