1512400 United States Covers Airmail (Scott c11). 94 Plate Number Singles on cover.

 

1928-1940 C11 Plate Number Singles Used on Cover (94)., Very clean grouping of 94 covers each showing use of a C11 plate single. Wide variety of numbers. Noted are commercial covers, Special Delivery, Lindbergh Day, First Flights, Airport Dedications, Adams Airmail Pickup, various cacheted covers, etc. Great for the plate number specialist., Very Fine