Picture 1:
The Jill DeVries centerfold was published in October 1975, but I think the date of these photos is anterior: the scenary is the same and the Lillian Muller centerfold was published in August 1975.
Obs: the small picture was published by Pb Brazil September 1980.
Picture 2:
The same photographic session. The scenary is different...
Picture 3:
... But the lingerie is the same.