The Bicentennial Series was a lengthy series of American commemorative postage stamps. It began with the issuance of a stamp showing the logo for the Bicentennial celebrations on July 4, 1971, and concluded on September 2, 1983, with a stamp for the Treaty of Paris. While many of the stamps showed the Bicentennial logo as a design element or contained the words "US BICENTENNIAL" or "BICENTENNIAL ERA", not all did. After the initial issue, few other stamps were issued through 1974. An annual issue of four stamps took place (usually on July 4 of each year): in 1972, honoring Colonial craftsmen; in 1973, Colonial communications; in 1974, the First Continental Congress. In addition, a block of four stamps was issued in 1973 for the bicentennial of the Boston Tea Party. In 1975, with the bicentennial of the start of the Revolutionary War, the series swung into high gear. Four stamps were issued honoring relatively obscure "Contributors to the Cause", of which the best known was Haym Salomon. On July 4, a block of four stamps was issued showing Revolutionary War uniforms, and with the bicentennial of the Battles of Lexington and Concord, the first of a standardized set began—showing a detail from a painting depicting the event commemorated, with the name of the event and year, and US BICENTENNIAL XX Cents (between 10 and 20). This "painting" format continued with an issue for the Battle of Bunker Hill in June. On January 1, 1976, a set of three stamps (lacking any text related to the Bicentennial other than the words SPIRIT OF 76) was issued, showing the well-known painting. On February 23, a pane of 50 stamps with the State Flags was issued, each stamp containing the Bicentennial logo and the words "BICENTENNIAL ERA 1776-1976". Four souvenir sheets were issued for the INTERPHIL international stamp exhibition in May, showing famous paintings depicting Revolutionary War events. It was followed with a Bicentennial stamp honoring Benjamin Franklin. Originally, the United States Postal Service had planned to issue another 50-stamp pane, showing the entire Declaration of Independence. Plans were shelved after the American Philatelic Society threatened the USPS with a "black blot" for excessive stamp issuance. Instead, a strip of four stamps showing part of the John Trumbull painting showing the presentation of the Declaration (often believed to show its signing) was issued on July 4 (parts of Trumbull paintings were used for