The Fifth Head of Cerberus

No book-club issue of the Scribner's first is documented in the sources consulted; the reliable negative tell is simply the absence of "A-4.72 [c]". The main traps are later reprints and "first thus" issues rather than club copies: Quartet (UK paperback), Ace (1976 paperback), and the Orb/Tor trade paperback reissues, the last of which adds an introduction by Brian Evenson and is a different edition entirely.