There is a very faint line of numbers of the backsides here, probably just processing lab info and nothing to do with when or where this photos were taken. They come from a collection of photos dating to the seventies or eighties, which does include other pictures of this fireplace, The pictures where the model faces us are damaged. one at the bottom and one at the top, possibly by getting stuck to something else with water or...something else, but this does not affect the warm model who ought to be your focus.  I think she then turns to show us the back of the swimsuit in the third, undamaged photo.  It isn't the same suit in all three photos, but it MAY be the same model