Page 286 - Sierra Leone to 1961 - The Collection
P. 286
Elizabeth II Definitive Stamps 1956 to 1961
Fourpence Black & Slate-Blue
6 October 1959 - Magburaka to Belgrade, Yugoslavia.
The airmail postcard rate to the British Commonwealth and Europe had been 7d since 1942.
No 7d stamp was ever issued after the George V period.
3 March 1956 - Mattru to Kitchener, Canada.
Incorrectly prepaid with single 4d. The correct rate was 3d.