1925 (May 9-12) Experimental Round Trip Experimental Flight, New York to San Francisco, airmail cover franked with 1923, 24¢ Airmail tied by "Air Mail Field, New York, N.Y.; May 9, 1925" postmark and addressed to the Air Mail Field in San Francisco, reverse address to Roessler in East Orange, N.J. and franked with 1923, 8¢-16¢ Airmails (8¢ s.e. at left) tied by "Air Mail Field, San Francisco, Calif., May 10, 1925" postmarks, Very Fine, a very rare flight cover with only a few carried and very few examples have ever been reported. Scott No. C4-C6. AAMC No. 172  Estimate $400 - 600. $0 (Image)