(Australia) Wartime airmail, Pacific Clipper services up to the attack on Pearl Harbour Canberra-New York, uncensored Intergovernmental cover franked 4/-, Australian violet diamond '2/NOT/OPENED BY/CENSOR'. Correctly rated 4/- per 1/2oz for carriage to US,  flown by Pan Am FAM19 to San Francisco, then US internal air service to destination. The Pacific Clipper service ceased after the Japanese attack on Pearl Harbour on 11/12/41.
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