The Regular Issues of 1922–1931 were a series of 27 U.S. postage stamps issued for general everyday use by the U.S. Post Office. Unlike the definitives previously in use, which presented only a Washington or Franklin image, each of these definitive stamps depicted a different president or other subject, with Washington and Franklin each confined to a single denomination. The series not only restored the historical tradition of honoring multiple presidents on U.S. Postage but extended it. Offering the customary presidential portraits of the martyred Lincoln and Garfield, the war hero Grant, and the founding fathers Washington and Jefferson, the series also memorialized some of the more recently deceased presidents, beginning with Hayes, McKinley, Cleveland and Roosevelt. Later, the deaths of Harding, Wilson and Taft all prompted additions to the presidential roster of Regular Issue stamps, and Benjamin Harrison's demise (1901) was belatedly deemed recent enough to be acknowledged as well, even though it had already been recognized in the Series of 1902. The Regular Issues also included other notable Americans, such as Martha Washington and Nathan Hale—and, moreover, was the first definitive series since 1869 to offer iconic American pictorial images: these included the Statue of Liberty, the Capitol Building and others. The first time (1869) that images other than portraits of statesmen had been featured on U.S. postage, the general public disapproved, complaining that the scenes were no substitute for images of presidents and Franklin. However, with the release of these 1922 regular issues, the various scenes—which included the Statue of Liberty, the Lincoln Memorial and even an engraving of an American Buffalo—prompted no objections. To be sure, this series presented pictorial images only on the higher-value stamps; the more commonly used denominations, of 12 cents and lower, still offered the traditional portraits.

The Series of 1902, also known as the Second Bureau Issue, is a set of definitive postage stamps in fourteen denominations ranging between one cent and five dollars, produced by the U. S. Bureau of Engraving and Printing and issued by the United States Post Office. Two denominations appeared in November and December 1902 and the other twelve were released between January and June 1903. These stamps were assigned the Scott Catalogue numbers 300 through 313. Also considered part of the series is a fifteenth stamp which appeared in November 1903—a second version of the 2¢ value, the original having faced severe criticism. This series, particularly noted for its exceptional ornateness and opulence of design, remained in circulation until late 1908, when it was superseded by the Washington-Franklin Issues.