Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Great Britain - 1935 (December 12), Pioneer Flight cover from London to Buenos Aires, franked by two horizontal pairs of 1s bister, each one with perfin HUTH, delivered by German aircraft from Stuttgart, machine arrival ''15.12.35'' ds, mostly VF, Est. $100-$150, Sc. # 200