Probably not worth a whole lot, but I thought the cover was cool so I bought it. It is bound in red leather. The copyright page reads as follows:
This edition first published in the United States of America
By arrangement with Doubleday & Company, Inc
In 1981 jointly by
William Heinemann Inc
And
Octopus Books Inc
747 Third Avenue,
New York, NY 10017
There's another edition of this that was published, I think, in the UK, which does not contain Night Shift but otherwise has an identical cover. Instead of being published by Heinemann/Octopus, it's published by Octopus/Heinemann. According to Justin Brooks' Bibliography (it's A14 in it), the one you show was published in September 1981, while the second one was published in July 1983. I got copies of each from the remainder tables at, I think, Waldenbooks, back when it was still around. I know I didn't pay much for either.