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VERY FINE APPEARANCE OF THE 1951 INVERTED "MARTYRS OF SCIENCE" OVERPRINT SOUVENIR SHEET. THIS IS THE UNIQUE EXAMPLE AND KEY TO COMPLETING A CUBA COLLECTION.
Accompanied by The Cuban Philatelist article from 2013 by Fernando Iglesias who describes this item. Other than having sold within the Ignacio Prats collection (sold intact in 2006), this hasn't been on the market for many years. (Image)