You are looking for from the late 1950s . The "1996" is likely a reprint date. The images will be black-and-white, highly stylized, and focused on the glamour and vice of the Portuguese elite during the Salazar era.
★★★☆☆ (3/5 – Four stars for the cinematography, minus two for the jazz flute soundtrack that loops every 11 seconds.) club private au portugal -1996- de francois clouzot
Below is an essay examining the cultural context of French adult cinema in the mid-90s, specifically through the lens of the Club Private series. You are looking for from the late 1950s
Today, the film is often cited by collectors and historians of the genre for its: club private au portugal -1996- de francois clouzot