History of Aviation, Rare Stamps and Postal History of the World, Part 3
Lot 1068:
1915, Prince Johann, 25h ultramarine instead of blue, error of color printed on ordinary paper, nice and fresh, full OG, F/VF, C.v. $1,550, SBK #3ya, CHF2,000, Est. $400 -$600 , Sc. #3b
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