Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1

Worldwide Air Post Stamps and Postal History - Switzerland

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Start price: $100

Buyer's premium:

1913 (March 11), Basel, 50c blue, used on color PPC together with 5c green, addressed locally, top right card corner crease, still F/VF, SBK #II, CHF700, Est. $150-$200