5¢ SIPEX Souvenir Sheet
Issue Date: May 23, 1966
City: Washington, DC
Printed By: Bureau of Engraving and Printing
Printing Method: Lithographed, engraved
This SIPEX issue was released to recognize the Sixth International Philatelic Exhibition at Washington, D.C., in 1966. It was the first international stamp show ever held in the Nation's capital.