This set of matching casters and salt cellars is extremely rare in American silver. Three individual casters of similar form by Jonathan Otis survive: one in the Garvan Collection, Yale University Art Gallery; one in the Rhode Island School of Design Museum; and the third in a private collection, published in Ralph E. Carpenter, Jr., The Arts and Crafts of Newport, Rhode Island, 1954, cat. no. 104, p. 162. Another surviving example of matching casters and salt cellars is a set by John Coburn of Boston, circa 1762, although the monograms are not the same, as they are on the present lot. They are now in the collection of the Museum of Fine Arts, Boston and illustrated in Kathryn C. Buhler, American Silver in the Museum of Fine Arts, Boston, 1972, vol. 1, cat. no. 268-9, pp. 313-14.