a pen-and-ink sketch of the Revolutionary War’s North Carolina Brigade’s August 1777 trip through Philadelphia to the Battle of Brandywine, was spotted in an art collector's apartment

the collector acquired the sketch from a New York antiquities dealer during the 1970s. The dealer found it in the New Jersey home of a doctor who treated artists during the Revolution. 

An inscription alongside the sketch reads: “an exact representation of a wagon belonging to the north carolina brigade of continental troops which passed thro Philadelphia august done by Du Simitière

https://news.artnet.com/art-world/american-revolution-drawing-by-simitiere-found-2459158

Du Simitiere served as the artistic consultant for the committees that designed the Great Seal of the United States, and in 1776 he submitted the first proposed design to include the Eye of Providence, which element was eventually adopted.

 Moreover, he suggested the adoption of the U.S. motto E pluribus unum ("Out of Many, One"). He also designed the Seal of New Jersey, of Delaware, and of Georgia. In 1779, du Simitiere painted the first known portrait of George Washington, later used for the 1791 one-cent coin.

He is now regarded as the founder of the first history museum in the United States

https://en.wikipedia.org/wiki/Pierre_Eugene_du_Simitiere