USA ½ Dollar 1923 Monroe Doctrine Centennial. Averse: Portraits of James Monroe and John Quincy Adams; who were both instrumental in formulating the Doctrine. Lettering: UNITED STATES OF AMERICA IN GOD WE TRUST 1923 S MONROE~ADAMS HALF DOLLAR. Reverse: Two female forms in shapes resembling North and South America. This image is said to have copied from a design created by Ralph Beck in 1899 Pan-American Exposition. Lettering: MONROE DOCTRINE CENTENNIAL 1823 1923 LOS ANGELES. Edge Reeded. Silver. KM 153