£12
Great Britain 1931-Imperial Airways-airmail envelope issued to commemorate First Airmail Flight-London to Mwanza, Tanganyika -cancelled 27.2.31 London on 2xSG420-1.1/2d and group of (4) SG419-1d control No.M19-back cancelled Imperial Airways, London and 10.3.1931 Mwanza
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