This is a rare opportunity to own two first day covers from the United States in 1979. These covers commemorate the 100th anniversary of the birth of the renowned physicist Albert Einstein and feature beautiful cachets. The covers are in very fine condition and are a must-have for any collector interested in historical figures or stamps from the United States. The denomination of the stamp is 15 cents, and the cancellation type is first day of issue. Don't miss out on this unique piece of history.