1510000 United States Covers Airmail. 1937 Around the World Flight.

  

1937 Around the World Flight, Hong Kong, Great Britain Triple Franked, New York Sep 21 1937 origination postmark, U.S. 634,C21-22, 10c Special Delivery on airmail envelope carried on cover to Hong Kong with Victoria '6 Oc 37' transit ties 20c,$1 Hong Kong stamps, on to London with 4 additional Great Britain stamps, arriving back in New York Nov 1 1937 completing  the Around the World Flight, an exhibit item, VF