When British South Cameroon joined federation, two stars where added. In 1972, the country became a unitary state and three years later two stars where replaced with just one. The flag was officially hoisted on 20 May 1975.
Proportions are aprox.
It was adopted when the former British territory of Southern Cameroon voted to join French Cameroun which became independent in 1957. The 2 stars signified the two territories. In 1972 Cameroon became a unitary state and the second star was subsequently dropped from the flag. The design of the flag changed in 1975 during the production of that book. The September 1961 issue of the 'National Geographic' magazine contains an article about the flags of the 99 states which were then members.