Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1037:
1912, Prince Johann, 5h-25h, complete set of three printed on thick chalky paper, perfect quality, full OG, NH, VF, C.v. $900, SBK #1x-3x, C.v. CHF1,150, Est. $250-$300, Sc. # 1-3
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