The circumstance prompting this move was a tendency for standard sterling coins shipped to the West African territories to leave the region and return to circulation in the UK, causing a local dearth of coinage.
A unique British West African variety of sterling coinage would not be accepted in the shops of Britain and so would remain in circulation locally.
In 1910, Australia commenced issuing its own distinctive varieties of sterling coinage, but the reasons for doing so were quite different from those relating to British West Africa.
Australian authorities issued local coinage as a step towards introducing a separate currency with a flexible exchange rate against sterling, while no such plan was considered for British West Africa.
[4] Togo and Cameroon adopted the West African currency in 1914 and 1916 respectively when British and French troops took over those colonies from Germany as part of World War I.