This 0.50 franc stamp from the Federal Republic of Cameroon features the Moustached Monkey, scientifically known as Cercopithecus cephus. The design shows the agile primate in its natural forest habitat, easily recognized by its bright blue face and distinctive “moustache” marking. Issued during the 1960s, it highlights Cameroon’s rich biodiversity and the importance of wildlife preservation. Printed by Chaix and designed by J. Combet, it remains a fine zoological thematic issue appreciated by animal and African wildlife collectors.