CEDEAO/ECOWAS (Economic Community of West African States) is a regional economic union of fifteen countries located in West Africa. Joint issue of Benin, Burkina Faso, Cabo Verde, Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Niger, Nigeria, Senegal, Sierra Leone and Togo. The joint mini sheet is known with first day cancellation 2015-05-28, but day of issue in most individual countries was delayed until 2015-12-17.
The stamps from this mini sheet have been extensively used in Guinea.