Sudan 1902 1m brown and pink Official error, SGO3c/d Guernsey These imprimaturs represent the first

These imprimaturs represent the first sheet printed of a stamp issue from the approved and finished printing plate

Maria Callas (1923-1977) was an American-Greek soprano and one of the most renowned opera singers of the 20th century

1½mm spacing on 'Small Dragons' set of 3 to 5c on 5ca olive-yellow tied to small piece by part Shanghai 'dollar chops'

Tanzania 1970-73 5c on glazed paper Official

Sudan 1902 1m brown and pink Official error, SGO3c/d Guernsey These imprimaturs represent the firstSudan 1902 1m brown and pink Official, Type O1 'O. S. G. S.' overprint, vertical pair, 'ERROR OVERPRINT INVERTED', from position 19 13 of the setting, position 19 additionally with printing variety Oval O, SGO3c d. A brilliant quality mint vertical pair with original gum. A great rarity of the British Commonwealth, with only six examples possible of the oval 'O', of which one is in the Royal Philatelic Collection and another was used. The Camel