Lot
2083 
1917, 1¢ green, used with 24¢ Jenny (C3) and 2¢ carmine (499) tied by purple "Air Mail Service Wash. N.Y. Phila. 'Washington' May 15 10AM First Trip" duplex on first flight cover from Washington D.C. to New York City. AAMC No. 101A $500. Scott No. 498 Estimate $200 - 300.
The airmail rate effective May 15, 1918 to July 14, 1918 was 24¢ per ounce. This was overpaid by 3¢, as airmail rates were frequently misunderstood since the 24¢ rate included special delivery service and ground leg if any.