Stephen Guernsey Cook Ensko (1896-1969) obituary in the New York Times on December 19, 1969.
Stephen G. C. Ensko, a rare silver and silver antique dealer, died Tuesday at his home after a short illness. He was 73 years old. Mr. Ensko succeeded his father in 1934 and took over the family business, Robert Ensko, Inc., at 682 Lexington Avenue. He was the author of two books on early American and British silversmiths, and dealt largely with museums and private collectors. He is survived by his widow, Dorothea; two daughters, Mrs. Dorothea Wyle and Mrs. Alice Woodward; two brothers, Robert and Lamont, and a sister, Mrs. Elathine Christie.
Source: New York Times; December 19, 1969