Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 971:
1915, Prince Johann, 25h dark cobalt, color variety printed on ordinary paper, nicely centered and post office fresh, full OG, NH, VF and rare, Raybaudi certificate, C.v. $2,450, SBK #3y, CHF3,500, Est. $1,000-$1,500 , Sc. #3a
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