From the 1st March 2018 Penguin Books changed to this type of photographic cover for all it's Raymond Chandler books. (this comment is from another edition of this book)
number-string on spine is the five-digit cat# prefixed with pocket books' (i)sbn publisher code, all with the cover price in cents given in three digits suffixed. (for a while - quite how long varying from publisher to publisher - this was quite a common sight on merkin mmpbs.) (this comment is from another edition of this book)