Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1353:
1927, First International Air Post Conference in the Hague, 10k dark blue and yellow brown, a white spot over ”7” in ”1927” variety at right (position 26), full OG, LH, VF, Est. $100-$150 , Sc. #C10 var
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