Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Belgium - Pioneers of Aviation - 1938, official postcard of the 1st International Exhibition of Pigeon Racing Federation with the Monument Pigeon- Soldier, numbered on reverse ''1550''; and real photo Aeronautic Propaganda maximum card, showing King Leopold with his aircraft and bearing a stamp of 35+5c green of the similar design, appropriate markings on front and reverse, VF and scarce, Est. $150-$200, Scott #B200, B210