Image #3
WORLDWIDE AIR POST STAMPS AND POSTAL HISTORY
Rocket Flights
Lot #
35 | L 
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1935 (May 9), Karel Roberti "Duibergen - Knocke" Rocket Experiment, three perf and imperf sheets of four or three stamps and 5 covers bearing these stamps in various combinations, each one signed by K. Roberti, neat inscription, all placed of 5 pages from a Collection, VF, Est. $800-$1,000
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