Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 158:
1913 (April 6), Start Aarau, 50c blue, yellow and magenta, used on color official PPC No.2 from Aarau to Olten, in addition unused single stamp with OG, previously hinged, both are VF, SBK #I, CHF1,200, Est. $300-$400
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