Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1720:
1926-29, Sibilla Libica, 20c green, perforation 11, top sheet margin vertical pair, imperforate at top and between stamps, nicely centered for this issue, full OG, NH (LH on top margin away from the stamp), VF and very rare, Sassone #54f, C.v. €10,000, Scott #39a var
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