Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Czechoslovakia -Military Unit in Egypt - Pioneer Flight - 1941 (April 5), cover to Chicago franked by three Egyptian values, including two of Airplane over Giza Pyramids 20m and 30m, tied by Czechoslovak FPO No.172, backstamped with FPO No.201 and machine Cairo ''10.APR.1941'' ds, Base censor band boxed seal, F/VF and rare item, a clipping from the Stamp Collector is included, Est. $300-$400