First U.K. edition, later issue with lettering, sphinx design and author's monogram in brown on tan cloth. Preceded by the American edition which contains many inaccuracies, thereby making this the definitive edition. Small octavo. pp [viii], 152. 32-page publisher's catalogue at rear. The first novel to employ the theme of time travel.Edges lightly spotted. Heavier spotting to endpapers and last few leaves of adverts at rear. Very good indeed. A bright copy.