1949 75th. Anniversary of the U.P.U., an excellent assembly including 60fi., 1fo. and Air 2fo. in upper marginal blocks of thirteen partially imperforate (to be cut into booklet panes), complete booklets (4) bearing the three values in panes of six - imperforate at edges, imperforate between, overprinted "Specimen" (2, imperforate vertically and imperforate between upper horizontal pair); 1950 3fo. miniature sheet perforated (2, one without serial number at lower left), and imperforate (2, one used), single 3fo. values perforated (3), imperforate and a further perforated proof example (in a slightly deeper carmine shade) inscribed "1950" in upper right corner. Photo