The fifth series of definitive stamps produced by the Bureau of Engraving and Printing was the 1938 Presidential Series, affectionately known as the “Prexies.” President Roosevelt chose to replace the 1922 regular issue, which featured Republican heroes, with a new series which would represent a broader, more united view of America by showing all the presidents, regardless of their political affiliation. Learn about how prexies were used during World War II with the pre-eminent master of prexies, Mr. Jeff Shapiro, presented by the American Philatelic Society.