Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 165:
1913 (May 4), Langnau – Bern, 50c dark brown violet, used on Oskar Bider postcards together with 5c green, tied by special air post marking, mostly VF, SBK #VI, CHF1,400, Est. $200-$300
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