WEST AFRICAN STATES / SENEGAL: 500 Francs (1991) in dark brown and dark green on multicolor unpt with man at right and flood control dam at center. S/N: "91572362363". WMK: Mans head. Code letter "K" and signature #22. Inside holder by PMG "Superb Gem Unc 67 - EPQ". Top grade in PMG. (Pick 710Ka).