1930 Columbia Air Mail 50c. on 36c. sage-green, S.G.191,

block of 4, a complete setting of the four types, rich colour, fresh, full original gum. Enzo Diena Certificate 1986 and B.P.A. Certificate 1998. EXCEEDINGLY RARE. CYRIL HARMER CONSIDERED THAT, AT THE TIME OF WRITING HIS HANDBOOK IN 1953, ONLY TWO MINT BLOCKS EXISTED. ONE OF THE GREAT NEWFOUNDLAND AND BRITISH EMPIRE BLOCKS.