1915, 10¢ Panama-Pacific, perf 10, Earliest Known Usage. Natural s.e. at left, in combination with 1912, 1¢ green, imperf, vertical pair tied by New York registry oval handstamp on Nassau Stamp Co. corner card cover to Milford, Conn., reverse with violet "New York, 8-13" oval date stamps and "Milford, Conn., Aug 14, 1915" receiving postmark confirming the year date of usage; cover with a few small tears and clipped corner, otherwise Very Fine, a remarkable earliest known usage of the 1915, 10¢ Pan-Pacific, Perf 10 issue, two weeks earlier than the current earliest usage of April 27, 1915; with 2007 P.F. certificate. Scott No. 404  Estimate $3,000 - 4,000. $0 (Image)