Published in 1931 as a limited edition of 1200 for $12.50 (when hardcovers sold for $2.00), the Random House edition has a new preface by Wells. The AIGA web site gives the design details for the book. Lloyd Currey in his Science Fiction and Fantasy Authors (Boston: G.K. Hall, 1979) says the limited edition was issued in unprinted tissue paper DJ and paper slipcase. There are also copies without the limitation statement on page . My copy is the latter one. This also came with a slipcase but I don't know if it is different from the limited edition's slipcase.
A division of Random House, The Modern Library, published a trade paperback edition in 2002 that reproduces the 1931 edition.
Below is the 1931 edition's front cover, slipcase and the four colour plates plus the Modern Library edition.