Willing, Morris & Swanwick (1754) was a mercantile firm that conducted general exchange and banking. It was run by Thomas Willing and Robert Morris; in 1783 John Swanwick joined the firm, changing the name from “Willing & Morris” to “Willing, Morris & Swanwick.”
“George Washington to Willing, Morris, & Swanwick, 10 June 1785,” Founders Online, National Archives, https://founders.archives.gov/documents/Washington/04-03-02-0042. [Original source: The Papers of George Washington, Confederation Series, vol. 3, 19 May 1785 – 31 March 1786, ed. W. W. Abbot. Charlottesville: University Press of Virginia, 1994, pp. 49–50.]
“Cadwalader Evans to Benjamin Franklin, 4 May 1771,” Founders Online, National Archives, https://founders.archives.gov/documents/Franklin/01-18-02-0065. [Original source: The Papers of Benjamin Franklin, vol. 18, January 1 through December 31, 1771, ed. William B. Willcox. New Haven and London: Yale University Press, 1974, pp. 96–99.]