Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1438:
1909 (June 29), 50th anniversary of the R.O.P.iT., 5pa/1k- 10pi/1r, set of seven used on registered cover from Constantinople to Nuremberg, German backstamp on reverse, VF, Est. $150-$200, Sc. # 40-46
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