This rare James I mother-of-pearl mounted cup shares a number of similarities with a small group of similar mounted objects such as an ostrich egg cup and cover of 1591, almost certainly by the same maker, in the Metropolitan Museum, New York, which was published in Y. Hackenbroch, Engish and Other Silver in the Irwin Untermyer Collection, New York, 1969, cat. no. 17, p. 11. The stems are almost identical with the three grotesque mask scroll. A coconut cup in the collection of Sir Chares Jackson also my the maker CB in monogram, has a related domed foot with strapwork ornament and related engraved scrolling foliage on the lip, with addition of acorns, see Sir Chares Jackson, An Illustrated History of English Plate, London, 1911, p. 664, fig. 873.