25¢ Antarctic Explorers
Issue Date: September 14, 1988
City: Washington, DC
Printed By: American Bank Note Co
Printing Method: Photogravure
This block of four stamps was issued as a companion to the 1986 Arctic Explorers stamps. This block was issued one month prior to Admiral Richard Byrd's 100th birthday. The set also honors Nathaniel Palmer, Charles Wilkes and Lincoln Ellsworth.