SIERRA LEONE: 50 Cents (1.7.1980) commemorating banknote in dark brown on multicolor unpt with President Siaka P Stevens at left. Low S/N: "A/1 000793". Red ovpt "COMMEMORATING THE ORGANISATION OF AFRICAN UNITY CONFERENCE FREETOWN 1980" in four lines at upper left center of Pick #4. Printed by TDLR. Inside holder by PMG "Choice Uncirculated 63". (Pick 9) & (part of Spink BSL BNP2a).