Lot 552 -
The incomparable "Rush" cover, described by Philip H. Ward, Jr. as "the most important cover known to American philately"
10¢ Black (2), Positions 55-60L, horizontal strip of six with inter-pane sheet margin at right, Position 57L (third stamp from left) is the "Harelip" plate variety, mostly full to large margins except at bottom center where just barely into framelines, tied by multiple strikes of red "5" numeral in circle cancel with....E. $ 400,000-500,000
Sold for US$ 510,000
(Link to this Lot in the Catalog for Bidding)