1893, Bradbury Wilkinson small format proofs on 2 exhibition pages including 3 imperforated die proofs perforated "SPECIMEN", die proof 10 centavos in blue, 7 different imperforated colour proofs 5 centavos and unissued colour 20 centavos purple-brown with 3 copies on piece and unused block of 12 and same stamp in perforated block of 4 (all with small punch holes); a very interesting group
