Proof 1970-73 range of imperforate proofs comprising 1970 Colombo Medical School, 1970 United Front (3, two (creased) with numerous notations regarding design ammendments), 1970 25th. Anniversary of United Nations, 1972 ECAFE (4), 1973 Bandaranaika Memorial Hall 15c. and 85c. values, the former in unissued colours, the latter unissued though in the colours of the issued 15c., and 1973 Rock and Temple Paintings miniature sheet (2, one with suggested ammendments for the 90c. value), all affixed to various printer's cards