Saar Franc
During the two times the Saar territory was economically split off from Germany, i.e. 1920-1935 as the Territory of the Saar Basin and 1947-1957 as the Saar Protectorate and 1957-1959 as the state of Saarland in West Germany, the French Franc (German: Franken) was the official currency of the territory. Although local notes and coins had been issued during both periods, legally the Saar-Franken was never a currency of its own.
Read more about Saar Franc: Appearance and Acceptance, External Links