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it is a genuine unused, o.g., never hinged, bottom margin Plate No. 21171 block of six, with natural gum creases and gum wrinkles and with three signatures in the bottom margin.
it is a genuine usage on a flown First Day cover to Passaic, N.J., tied by a New York, N.Y Oct 2, 1933 c.d.s. and wavy line machine cancel, with appropriate Graf Zeppelin flight cachets and a Pernambuco, Brazil receiving backstamp.
it is a genuine usage on cover to Marseilles, Ill., tied by an Akron, Ohio Oct 25, 1933 c.d.s. and wavy line machine cancel, with the appropriate Graf Zeppelin flight cachet and a Chicago, Ill. receiving backstamp.
it is a genuine usage on a cover to Germany, tied by an Akron, Ohio Oct 28, 1933 c.d.s. and wavy line machine cancel, with an appropriate Graf Zeppelin flight cachet and a Friedrichshafen receiving backstamp.