USSR. 1929. Record flight Moscow-East Orange (USA) by aircraft "Krylia Sovietov " (wings of the Soviets).

Cover of registered air mail letter sent from Moscow to East Orange, New Jersey (USA) on August 7, 1929, along the route Moscow - Khabarovsk - Seward (Alaska, USA) - Seattle (USA) - East Orange (USA) by aircraft "Krylia Sovietov ". Flight length is 13 300 miles. Only 10 letters are known at the present time. Envelope was opened for exhibiting. Very rare.
Catalog Muller 25000,00.