Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 59:
1938 (April 30 – May 7), real photo Aeronautic Propaganda PPC (King Leopold III with his military aircraft) in fact maximum card with King Leopold stamp 35c+5c green is affixed over, sent by round flight Brussels-Tripoli-Brussels, uprated by Libya 50c and 1L (#C32-33), appropriate markings, VF, Est. $100-$150, Sc. # B210
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