This was recently auctioned off. Some details here.
Comments by Adam (aka Whitecaps):
I remember being in the local library (main branch) sometime between 1983-1985 and seeing Greta Scacchi in a nude pictorial in, I think, Vanity Fair Magazine. I believe this was a month after Elle MacPherson did a nude pictorial for, I believe also Vanity Fair Magazine. (Add: it might have been GQ Magazine. If I didn’t imagine the whole thing, I’m sure it was one or the other.)
I think a couple people have told me that my memory must be faulty because Greta Scacchi never did a nude pictorial for Vanity Fair (or for any other magazine) but this image (above) has been making the rounds recently.
Given that the pic above was taken in 1991, it’s not from the pictorial you remember in 1983-85.
Maybe you have the date wrong. Greta supposedly did this kinda-sorta nude for British GQ in August 1995, photographed by Rankin.