1893 SILVER 900 coin Columbian Exposition HALF DOLLAR CHRISTOPHER COLUMBUS. Value ½ Dollar = 50 Cents Currency Dollar (1785-date) Composition Silver. 900 Weight 12.8 g Diameter 30.61 mm Thickness 2.15 mm Shape Round. Commemorative issue Columbian Exposition. Obverse Portrait of Christopher Columbus facing right with the denomination below Script: Latin Lettering: UNITED STATES OF AMERICA COLUMBIAN HALF DOLLAR. Script: Latin Lettering: WORLD’S COLUMBIAN EXPOSITION CHICAGO 14 92 1893 Edge Reeded.