Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 103:
1936 (February 28), First Flight pre-printed cover on line Monrovia – Harper (322 miles), franked by black surcharge 6c on 2c violet, the same day Harper postmark on front and reverse, VF, expertized by G. Buhler, C.v. $275 for used stamp off cover, Est. $200-$300, Sc. #C1
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