Ballantine "Special" 27055

From Tom Daniels, of Springfield, MO, comes a scan of a book that calls itself a "Ballantine Special Book Club Edition," with no number listed on either cover or spine.

The copyright page, however, lists a ISBN
#0-345-27055-X, which means the book actually should bear the book number 27055.

I have no idea what sort of "Special Book Club" the label refers to.