Banco Nacional Ultramarino, Angola, 2 1/2 escudos, 1 January 1921, black serial number 2037995, bue, lilac and orange, Fancisco de Oliveira Chamico at left, steamship seal at right, arms low centre, two printed signatures below, blue ANGOLA overprint at top centre (Pick 56a), in PMG holder 35 CHOICE VERY FINE, only one issued example listed on Track and Price at time of cataloguing and quite possibly surprisingly rare