Lot
2764 
United States, 1921 (May 3) Experimental Flight, San Francisco - New York. Cover franked with 6¢ airmail tied by San Francisco machine cancel, additional "Airmail Mail Service" oval date stamp and straight line handstamp, Very Fine, a scarce experimental flight. AAMC No. 144. Scott No. C3 Estimate $200 - 300.
Realized: $325