Quote:
12/16/39 - Finishing the aicraft setup - roundels painting.
12/18/39 - Instruments inspection by the Center`s pilot.
12/19/39 - Equipment verified during flight.
12/20/39 - (flight interrupted due to fog)
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http://kurfurst.org/Performance_test...formanceT.html
They certainly could have used their own measurements. We don't know enough to determine it and any other conclusion is just a guess.