Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 161:
1913 (March 30), Bern, 50c red lilac, used on Oskar Bider postcard together with 5c green and black and orange label promoted Agriculture Exhibition of 1914, excellent quality, VF, SBK #III, CHF280, Est. $100-$150
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