The 2¢ Landing of Columbus is the most common stamp of the Columbian
Issue.

Often cited as the world’s first commemoratives are the sixteen stamps of the
United States Columbian Issue, produced to help celebrate the World Columbian
Exposition in Chicago honoring the 400th anniversary of Christopher Columbus’s
arrival in the New World in 1492. The stamps are today highly prized by collectors.

The $1 stamp is included in the US issue of commemoratives introduced
in 1893.