Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1807:
1906, 5r dark blue, green and pale blue, perforation 13½, bottom sheet margin single printed on vertically laid paper, imperforate at bottom, full OG, NH, VF and rare, Est. $1,500-$1,800, Scott #71 var
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