The edition shown above seems to be some type of early release, which was available in Australia in Nov. 1997, with a marked price of 17.99. It does not have the Rushdie blurb that appeared on the official British release which appeared in Jan. 1998, with a price of 18.00.
Back cover blurb:
"Underworld's intellect, its view, its fabulous drama, its soul, its passion and compassion, and the beauty of the writing, just the size and generosity of it are all of some spectacular high order. I can't imagine any writer reading it without complete admiration and a kind of gratitude because if a book like that can be written in a culture like this, it's terrific for all of us." --Michael Herr, author of Dispatches
The Rushdie blurb is on the front cover: "Underworld is a magnificent book by an American master." This is the last line from a longer blurb on the back cover.