Two watch reference books, comprising: Gordon, George,...

Two watch reference books, comprising: Gordon, George, Rolex, Hans Wilsdorf and the Evolution of Time, 1905 - Present, Alan Zie Yongder, Zie Yongder Co., Ltd, Hong Kong, 1989, in slip case with Certificate of Ownership stating First Edition No. 29406; Gordon, George, Cartier, A Century of Cartier Wristwatches, Alan Zie Yongder, Timeless Elegance Co. Ltd, Hong Kong, 1989, in slip case with Certificate of Ownership stating First Edition No. 04374