Rocket Mail Label ?

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There is a catalog of Rocket Mail. If I remember correctly it is called the E-Z Catalog of Rocket Mail.

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In 1936, Zucker agreed to make rocket flights in the U.S. and Canada in conjunction with the Third International Philatelic Exhibition (TIPEX) held in New York. Zucker was arrested in Germany before he could come to New York. German stamp dealer, Karl Henning, had prepared stamps, covers and cancellations for the flights which he brought to TIPEX along with the rocket launching rack. Although the Niagara Falls flight did not take place, the Henning souvenirs are colourful reminders of rocketry's pioneer era.