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VERY FINE. THIS COVER WAS DISCOVERED BY US IN AN OTHERWISE MODEST CONSIGNMENT AND, ACCORDING TO OWNER'S PURCHASE DATE ON BACK, HAS NOT BEEN AVAILABLE TO THE MARKET FOR OVER 60 YEARS. A VERY IMPORTANT UNITED STATES FIRST DAY COVER, OF WHICH THERE ARE FEWER THAN FIVE KNOWN.
Accompanied by an American Philatelist article, "First Day Covers of U.S. 1918 Air Mail Stamps", by Ken Lawrence, which documents five 6c 1918 covers plus an additional three possible First Days. (Image)