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it is a genuine usage of a block of four on a registered cover from Shanghai, China to Washington, D.C. - the block with a Shanghai, China U.S. Postal Agency Registry Division cancel and toned spots on the right pair - the cover with a Shanghai Registered No. 50653 marking, a Jan 9, 1920, Shanghai REGISTERED backstamp, purple Feb 16, 1920, Chicago REGISTERED markings on the front and back and a Feb 07, 1920 Washington, D.C. receiving back stamp and docket number 48077 on the front.