Two of the stamps from the Kingsford-Smith Commemorative set were used officially and overprinted "OS" the 2 and 3 Pence values. The original 6 Pence issue was not overprinted for official use. However the 6 Pence was re-issued later in the year with a change of colour from violet to sepia and the legend "Air Mail Service" substituted for the original "Kingsford-Smith World Flights" and this issue was used for official purposes and overprinted "OS".
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