Ace #12311. Spine and covers a bit creased, spine slightly slanted, corners bumped, some edge wear and rubbing to covers, page 110 creased. Numbers written on front free end paper and title page. Some browning but text is clean and unmarked. No edition stated, but this book appears to have been printed about the mid 1960s.
"Everything gets a second chance! That's the shattering discovery Blake Walker made when he learned that there are innumerable parallel worlds-on each of which history has taken a different alternate path!"; 16mo - over 5¾" - 6¾" tall