Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Egypt - Zeppelin Flights - 1931 (April 10-13), Egypt Return Flight cover, franked by both Zeppelin surcharges, including error ''1951'' 50m/27m, tied by Cairo ''10.AP.31'' ds, Friedrichshafen ''13.4.31'' arrival marking on reverse, VF, Sieger #105Axa, Ay, C.v. €350, Scott #C3a, C4