ROCKET MAIL cover

• Rocket-flown by Karl Roberti on December 6, 1934 - near KATWIJK AAN ZEE
• Netherlands postage tied by NRB P.9 cachets; not posted
• Numbered, dated, and signed by Roberti in black ink
• Purple "explosion" cachet on the reverse
• EZ 3C1 - some wrinkling

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