Proof Block Larger Than four 1979-88, plate proofs (10,043), plate proof progressives (21,622), miniature sheet proofs (919, including 329 progressives); countries consist of Bhutan, Burkina Faso (Upper Volta), Burundi, Central African Republic, Comoro Islands, Congo Republic, Haiti, Ivory Coast, Jordan, Liberia, Libya, Mauritania, Niger, St. Thomas and Prince Islands, Yemen Arab Republic and Zaire; issues include Aviation, Butterflies, Olympics, Rockwell, Rowland Hill, Royal Wedding (1981), Sea Shells, Space and 1982 World Cup