This striking red postage due stamp was issued by Afrique Occidentale Française (French West Africa), a federation of French colonial territories in West Africa. It features the denomination “10c” within an ornate geometric design, inscribed POSTES CHIFFRE-TAXE above and RF (République Française) below. Such postage due stamps were used to indicate payment owed on underpaid or unpaid mail. The bold design and strong red color give it a distinctive presence among colonial-era issues. For collectors, it represents both the history of French colonial administration and the specialized field of postage due philately.