MALI (1972) Swimmers-200 meter breaststroke*. University library*. Aztec sculpture*. Die proof in violet signed by the engraver MONVOISIN. Mexico Olympics retrospective. Scott No C163, Yvert No PA163.
AVAILABLE AT $160
NIGER (1968) Diving*. Scott No C91. Yvert No PA91. Mexico Olympics. Die Proof in dark blue signed by the engraver BETEMPS.
AVAILABLE AT $140
DAHOMEY (1975) Divers*. Die proof in green signed by the engraver MONVOISIN. Montreal Pre-Olympics issue. Scott No C238, Yvert No PA242. Only 28 exist. Rare
AVAILABLE AT $90