William Heinemann reprinted CRY WOLF only a couple of times: in 1989 for a Uniform Edition and again in 1991 for the Uniform Edition. I have owned a couple of copies of CRY WOLF that were not printed by Cox & Wyman, and with a dust jacket that looks like the first edition DJ, but is laminated, whereas the first edition DJs are matte. Additionally, if I recall correctly, the laminated DJs bear no price, whereas the first editions DJs have a price of £3.90 net. Therefore, I suspect that, although these copies did not include a reprint statement, they were in fact NOT printed in 1976.
I found the signed copy below on eBay, but it is not in my collection.
I have owned and sold a few signed copies of CRY WOLF. All below are first printings.
Doubleday reprinted its first edition so not all copies are first printings of the first edition.
The copyright page has to state FIRST EDITION IN THE UNITED STATES OF AMERICA