With the introduction of decimal currency in 1964, a new series of Banknotes was introduced by the Bank of Sierra Leone. Originally called Shillings, the unit name "Leone" was finally decided upon. After considering (and subsequently rejecting) several new designs, including a particularly attractive multi-coloured design, notes were issued in the 1, 2 and 5 Leone denominations. These officially replaced notes of the British West African pound at a two leone to one pound exchange ratio. 50 cents notes were introduced in 1979, followed by 10 leones in 1980 and 20 leones notes in 1982. Throughout this period the value of the currency was fixed and remained relatively stable despite inherent economic problems.