No, not that kind of centrefold, this one is much better! It is a promotional poster of Robin Johnson in Nicky Marotta’s “Damn Dog” costume (but with her original guitar):
The weekly trade publication Radio and Records, in an article subtitled “A New Wave Saturday Night Fever,” reported that Times Square had a production budget of $6 million, and a promotional budget of $500,000. This “centrefold poster” in the 21-28 June, 1980 edition of trade weekly Screen International (London, UK, n. 246, pp 12-3) is evidence of that promotional budget. The full-color poster, on (double) A3 paper, was published seven months before the film’s UK release.