the Statue of Liberty on the reverse of the coin was sufficient to convey the message of liberty. The text of the act does not specify the color of the coins, but per the U.S. Mint "the specifications will be identical to those used for the current Golden dollar". The George Washington $1 coin was first available to the public on February 15, 2007, in honor of Presidents' Day, which was observed on February 19. This marked the first time since the St. Gaudens Double Eagle (1907–1933) that the United States had issued a coin with edge lettering for circulation. Edge-lettered coins date back to the 1790s. The process was started to discourage the shaving of gold coin edges, a practice which was used to cheat payees. In December 2007, Congress passed , moving "In God We Trust" to either the obverse or reverse of the coins. This is the same bill that created a program that included quarters for Washington, D.C., Puerto Rico, Northern Mariana Islands, Guam, the U.S. Virgin Islands, and American Samoa. The act had been introduced because of the failure of the Sacagawea $1 coin to gain widespread circulation in the United States. The act sympathized with the need of the nation's private sector for a $1 coin, and expected that the appeal of changing the design would increase the public demand for new coins (as the public generally responded well to the State Quarter program). The program was also intended to help educate the public about the nation's presidents and their history. In case the coins did not catch on with the general public, then the Mint hoped that collectors would be as interested in the dollars as they were with the State Quarters, which generated about $6.3 billion in seigniorage (i.e., the difference between the face value of the coins and the cost to produce them) between January 1999 and December 2008. Unlike the State Quarter program and the Westward Journey nickel series, which suspended the issuance of the current design during those programs, the act directed the Mint to continue to issue Sacagawea dollar coins during the Presidential series. The law states that at least one in three issued dollars must be a Sacagawea dollar. Furthermore, the Sacagawea design is required to continue after the Presidential Coin program ends. These requirements were added at the behest of the North Dakota congressional delegation to