Actual publication date not listed in book. Date from Charter Books edition of the same book, #31462 3rd printing. That edition lists the title as being a Ace/Charter printing, but, even though Berkley Books (owners of Charter Books) eventually took over Tempo, this book was not Ace/Charter book at time it was published.
Though not listed in the book, this is the first printing.
On sale date from the publication date reported to the U.S. Copyright Office found in the Catalog of Copyright Entries, Third Series, Volume 31, Part 1, Number 2, Section 2, Books and Pamphlets, Including Serials and Contributions to Periodicals, July-December 1977. Copyright registration number A925067.