1940 AIRMAIL BIRMINGHAM TO SANTIAGO, CHILE WITH SINGLE 10S DARK BLUE (SG478). Envelope, tear at left well clear of stamp, airmail Birmingham to Santiago, Chile with very fine 10s dark blue (SG478) cancelled 'BIRMINGHAM' date stamp 9 APR 1940. On reverse 'SANTIAGO' date stamp 18 APR 40, rare single usage of the 10s dark blue paying the 5s double rate via Air France. (Ref 143216).
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