Robert Dighton, Brook Watson, 1803, hand-colored etching on laid paper, 25.2 x 15.2 cm. Webster Canadian Collection, New Brunswick Museum, Saint John, N.B.

Watson eventually became a successful merchant in London. It is likely he commissioned the painting from Copley, whom he probably knew through members of the artist's family. Copley and Watson probably met in London during the summer of 1774, when the artist was passing through London on his way to Italy. On August 17, he wrote, "To Morrow I... Dine with a Mr. Watson."