Ruanda-Urundi franc. The Ruanda-Urundi franc was a currency issued for the Belgian mandate territory of Ruanda-Urundi in 1960???62 which continued to circulate within its successor states of Rwanda and Burundi until 1964. The currency replaced the Belgian Congo franc which had also circulated in Ruanda-Urundi from 1916???60 when the Belgian Congo became independent, leaving Ruanda-Urundi as the sole Belgian colonial possession in Africa. With the independence of Rwanda and Burundi in 1962, the shared Ruanda-Urundi franc continued to circulate until 1964 when it was eventually replaced by two separate national currencies.