ROCKET MAIL stamps - sheet of 4

• Stamps of this design were originally used on mail during February 23, 1936 rocket tests
• Overprinted in 1951 for the 15th anniversary of the GREENWOOD LAKE rocket tests
• Also commemorates the 75th anniversary of the UNIVERSAL POSTAL UNION
• EZ 18A2 - overprinted sheet of 4
• Very good condition

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