United States | 1957 Air Force 50th Anniversary Block of Four 6-Cent US Air Mail Postage Stamps

Description

These 6-cent air mail postage stamps were issued to commemorate the 50th anniversary of the United States Air Force as part of the National Defense System.
This issue was first released at Washington, D.C., on August 1, 1957.
Printed By: Bureau of Engraving and Printing
Perforations: 11X 10 ?
Format: Block of four stamps
Condition: mint never hinged.