Image #1
WORLDWIDE AIR POST STAMPS AND POSTAL HISTORY
Rocket Flights
Lot #
156 | 
| Scott # 164
|
1935 (April 23), Karel Roberti Katwijk aan Zee Neerlandia "P.P.1" two Flight covers, franked by definitive stamp of 1/2c gray in strip of three, tied by Katwijk date stamps, each one is bearing semi-official label, either in green or black (triangle), parachute cachet in red or blue, plus square flight marking in blue, each one signed by K. Roberti, placed on 2 pages from a Collection, mostly VF, Est. $600-$700
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