United States | Einstein Block of Four 15-Cent United States Postage Stamps Issued 1979 Chocolate

Description

This block of four 15-cent US postage stamps was issued to honor Albert Einstein, marking the 100th anniversary of his birth and commemorating the Nobel Prize winner’s special and general theories of relativity.
Issue Date: March 4, 1979
First City: Princeton, New Jersey
Printed By: Bureau of Engraving and Printing
Printing Method: Engraved
Perforations: 10 ? x 11
Color: Chocolate
Mint, never hinged condition.