Cape Verde. Portuguese administration. Banco Nacional Ultramarino. 1971-1972 "Serpa Pinto" Issue. Date: 04.04.1972. Material: paper. Solid security thread. Printer: Bradbury, Wilkinson & Company LTD Gravadores. Multicolored front and back printing, predominantly blue. Description: texts in Portuguese. Portrait of Portuguese soldier and explorer Alexandre de Serpa Pinto (1846-1900) at right. Coat of arms in the center. Seal of the bank on the left (Type II, Lisboa). Three combinations of signatures with Administrator and Vice-Governador. Back: texts in Portuguese. Guilloche frame and rosettes. Allegorical woman and ships in the center. Known specimen overprinted in red diagonally on the front and back, stamped with a number in the margin. Color blue. Undated. Cancelled by double perforations.