Proof The small collection of Bradbury Wilkinson die proofs (34) on gummed paper (57x70mm.), comprising 1960 unissued Santos 2c. in violet (4) and brown (3), 1960 (Nov.) Santos 1c. in blue and brown (7), Express 1962 20c. magenta (5, shades) and Official 1963 10s. purple (14, all with heavy blue ink smears).