Newfoundland 1932 DO-X Surcharge, $1.50 on $1 blue, surcharge inverted, l.h., well centered, fresh and v.f., signed Diena and Herbert Bloch, with 2002 Vincent Greene and 2004 BPA certificates. These stamps were printed in sheets of four for use on the return flight of the Dornier DO-X from New York to Germany. While it has been estimated that as many as 13 blocks of four may have had the inverted surcharge applied in error, only 20-40 stamps still exist today. A major rarity, (Catalog value $20,000)
(via Philasearch.com - Newfoundland Airmail stamps, Scott C12a)
http://ift.tt/2D3J1cF
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