Issuing Institute of French Equatorial Africa and Cameroon. Banknote issued in 1957 but undated. Identical to the pick: # 21 except the title of the issuing institute which changes by: "Issuing Institute of French Equatorial Africa and Cameroon". Work of Pierre Munier and engraving of Hourriez for the front and Pierre Munier and engraving of A. Chapon for the back. Printer: Bank of France. Dimensions: 116 x 64 mm. Seamless watermark composed of small boats and anchors. Front and back: Multicolored printing. Front: The issuing institute (A.E.F), the value in figures and letters are printed in blue. The numbering and the signature are printed in black. On the left, portrait of Jean-Baptiste Colbert, Minister of Finance and Secretary of State for the Navy of Louis XIV and on the right a fleet of commercial boats on the ocean. Two types of signatures: The President, Georges Armand Gautier and The Director General, Claude Panouillot. Back: Lush exotic landscape and a view of a river on which a pirogue sails. At the bottom of the back right, article 139 of the Penal Code printed in a light blue cartouche. Specimen of the issued note on alphabet C.1 with "SPECIMEN" perforated diagonally in the center of the bill and perforated by two triangles of cancellation. Another specimen identical but with an oblique overpint "SPECIMEN" in black on the front.