25¢ Creatures of the Sea
Issue Date: October 3, 1990
City: Baltimore, MD
Printed By: Bureau of Engraving and Printing
Printing Method: Lithographed and engraved
This block of four was a joint issue between the U.S Postal Service and the Soviet Union’s Ministry of Posts. The issue focused worldwide attention on marine mammals inhabiting the earth’s oceans. The historic issue is a shining example of the U.S. and the Soviet Union working together for the world’s common good.