Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Vatican City - Pioneer Flights - 1939 (July 12-19), Special Flight Brussels - Rome mixed franking cover, bearing two Belgian Basilica stamps, tied by Brussels 2nd International Salon de l'Aeronautique ''12.7.39'' special marking, uprated by Vatican Pope Pius XII, complete set of four, cancelled with ''19.7.39'' ds, Rome the same day arriving handstamp, VF and rare, 19 items carried, Est. $300-$400, Scott #68-71