From ARTnews, the story of unauthorized 19th Century Chinese copies of classic works of art, including Gilbert Stuart's classic portrait of George Washington:
The situation bothered the painter so much that collectors of his portraits had to sign an agreement stating that only he had the right to reproduce the image. There was no American copyright law covering works of art, and forged and unauthorized copies of Stuart’s portraits of Washington had become something of a growth industry.
“There was also a considerable demand for the Chinese Washington portraits in oil on canvas,” wrote Crossman. One popular subject was the Apotheosis of Washington, which shows the president born aloft by angels. A glass version is in the collection of the Terra Foundation of American Art in Chicago. The original engraving, Apotheosis of George Washington (1802), was by John James Barralet (1747–1815).
Crossman noted that China trade paintings on glass based on American prints were also sought by American collectors. Among the favorites were Liberty, John Paul Jones, America, Battle of Lexington, and The Landing of the Pilgrims.