@fred: I went and looked closely at the cover. There is a very faint see-through effect in the letters of “Zelazny” and not in the yellow band that carries them. The flash has brought it out, I’d not noticed it before.
The stain on “Immortal” is the remains of a price ticket.
@moderator: this is a Methuen Paperback, not a Methuen Teen Book, whatever one of those is.
The story was first published as a two-parter in F+SF in 1965, and as a novel by Ace in 1966. Won the Hugo in ’66, joint award with Dune! Herbert got a Nebula that year as well, though, so he gets the edge.
This Immortal is one of – the first of – Zelazny’s pantheon-themed novels (cf Creatures of Light and Darkness (very very good) and Lord of Light (pretty good)). this one is Greek Mythology, and the titular Immortal is not a muscular hunk. It helps if you know a bit of Greek myth beforehand, and apparantly if you are very well-versed then a lot of deeper meanings are revealed.