Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 57:
1935, Sabena First Round Flights two mixed franking pre-printed covers, first one (February 23-March 8) on line Brussels-Leopoldville- Brussels, the other one (November 15-29) on line Brussels-Elisabethville- Brussels, each one franked by 5 Belgian and Belgian Congo air post stamps, appropriate flight cachet and arrival markings, VF, Est. $150-$200
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