Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 167:
1931, dark blue Airplane and Air Mail overprints, ½p-£1, complete set of 13, full OG, NH, mainly VF, most stamps with tiny Zumstein guarantee hs on reverse, SG #1/13, £250 as hinged, Est. $250-$300, Sc. # C1-13
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