Looks like a PL strike. But yes, almost the whole reverse should show flat field doubling.
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
The specimen strikes we're either in the blue clamshell cased single, or part of the Double Dollar Prestige set, the latter of which had the notorious "red fluff" that negatively affected the coins over time.
This is a specimen strike that was rescued from a Prestige set in a very dry Prairie climate, and you can still The cloudiness on the obverse, imparted from the Prestige set lining.
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
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