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1933 SG235a.

$4.50 on 75c Yellow-brown. 'SURCHARGE INVERTED'.  

AIR BALBO MASS TRANSATLANTIC FLIGHT.

Brilliant fresh mint with beautiful colour and perforations.

David Brandon, Alberto Diena  and Enzo Diena Certificates.

Position 1 of the UNIQUE 'sheet' of four stamps.

THE RAREST AND MOST IMPORTANT ITEM OF NEWFOUNDLAND AND ALL AIR MAIL PHILATELY .