WHO IS THIS WILLIAM PETT RIDGE ADVERTISING POSTER: 1897 poster, full title ''Who is This? This is Mr. Pett Ridge's Modermly Heroine in the new serial. See To-Day''. Artowrk by E. Orrest, published J.S. Virtue & Co. Lithos's. 30 1/4'' x 20'', backed with linen.