The copy of the Declaration that was signed by Congress is known as the engrossed or parchment copy. It was probably engrossed (that is, carefully handwritten) by clerk Timothy Matlack. A facsimile made in 1823 has become the basis of most modern reproductions rather than the original because of poor conservation of the engrossed copy through the 19th century. In 1921, custody of the engrossed copy of the Declaration was transferred from the State Department to the Library of Congress, along with the United States Constitution. After the Japanese attack on Pearl Harbor in 1941, the documents were moved for safekeeping to the United States Bullion Depository at Fort Knox in Kentucky, where they were kept until 1944. In 1952, the engrossed Declaration was transferred to the National Archives and is now on permanent display at the National Archives in the "Rotunda for the Charters of Freedom".