Philadelphia, September 17, 1787. Not only was Hamilton one of the signers of this document but the names of the states listed before the names of the signers are also in Hamilton’s writing.
“Constitution of the United States, 17 September 1787,” Founders Online, National Archives, https://founders.archives.gov/documents/Hamilton/01-04-02-0138. [Original source: The Papers of Alexander Hamilton, vol. 4, January 1787 – May 1788, ed. Harold C. Syrett. New York: Columbia University Press, 1962, p. 274.]