Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 673:
1915, Prince Johann, 25h ultramarine, color variety printed on ordinary paper, nicely centered and post office fresh, full OG, NH, VF and scarce, Raybaudi certificate, C.v. $1,550, SBK #3ya, CHF2,000, Est. $400-$600, Scott #3b
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