The Liberty issue was a definitive series of postage stamps issued by the United States between 1954 and 1965. It offered twenty-four denominations, ranging from a half-cent issue showing Benjamin Franklin to a five dollar issue depicting Alexander Hamilton. However, in a notable departure from all definitive series since 1870, the stamp for a normal first-class letter—the 3-cent value—did not present the portrait of a president, but instead offered a monocolor :File:Stamp US 1954 3c Liberty.jpg|image of the Statue of Liberty. Moreover, two-color renderings of the Statue of Liberty appeared on both the 8 cent and 11 cent stamps; and it is from these three denominations that the Liberty issue takes its name. Pictures of other national landmarks, such as Bunker Hill and Mount Vernon, are found on several values, while the rest of the stamps follow tradition, containing portraits of well-known historic Americans. The six denominations in the set that illustrate buildings were all designed in landscape format, resulting in a free intermixture of landscape and portrait orientation for the first time in a definitive U.S. issue. Like three previous U. S. definitive issues, the Liberty series offered one—and only one—image of a prominent woman. But while Martha Washington had played this role in the series of 1902, 1922–1925 and 1938, the Liberty Issue eliminated her, instead presenting Susan B. Anthony, portrayed on the 50-cent stamp. The Liberty Issue was the first definitive series including multiple presidents issued since 1861 which did not contain a single stamp honoring a recently deceased president. To be sure, the only president who would have qualified, Franklin D. Roosevelt, had died quite a while before—some nine years—and, moreover, was not admired by the political party that introduced the new series. FDR was the first deceased president since Chester A. Arthur to have been excluded from the next multi-president definitive series to appear after his death—denied an honor that had been accorded to his eight predecessors in office: Cleveland, Harrison, McKinley, Theodore Roosevelt, Taft, Wilson, Harding and Coolidge. It is also notable that only 28% of the Liberty series stamps offered images of presidents : a smaller presidential percentage than had appeared on any previous U. S. definitive issue. Release of the Liberty series began in 1954, and the set was essentially complete by 1960, but a few values were added subsequently. While the Liberty stamps were generally replaced by the Prominent Americans series, issued starting in 1965, several of its denominations remained on sale for a considerable period of time afterwards. Most notably, two coil stamps—the 2 cent Thomas Jefferson and the 25 cent Paul Revere—were repeatedly reprinted, continuing on sale well into the 1980s. Remaining stocks of the 12 cent Benjamin Harrison stamp were sold at some post offices in 1981 to meet the new postal card rate as the United States Postal Service was not able to issue a new 12 cent stamp prior to the implementation of the rate increase. Over the time span that the series was issued the technology of printing postage stamps changed. This led to many of the stamps having varieties with different papers, perforations and the addition of a phosphor coating. Thus at this more specialized level the series is rather complex. The 1/2 cent stamp was the last issued of that denomination for use as postage, although a postage due stamp of that value was issued in 1959. It was also the last appearance of Franklin on a lower value stamp in a regular series, a tradition that had been followed since 1847. In this series, two of the fractional denominations—1¼¢ and 2½¢—appeared on U. S. postage stamps for the first time.
In late 1954 5000 panes, each 100 stamps, of the 2¢ Jefferson, Scott catalog 1033, were printed on experimental bright Silkote postage stamp paper. These were released at a few post offices in Maine. It is estimated that no more than 400 of these stamps, which have been designated "1033a", still exist.
