Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

Philatelic Exchange Tax Stamps - Covers with Air Post Franking

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Start price: $100

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1936 (March 13), registered air mail cover from Moscow to Austria, franked by three air post adhesives, tax stamp with black surcharge 50k on 35k ultra is on reverse and tied by 13-line official cachet, Vienna ”17.III.36” arrival ds, minor soiling, still VF, Est. $200-$250, Scott #C20, C39, C60, SC #PE24