I was guessing Bermuda 40, but the portlights and chainplates are different. Similar fore and aft overhangs... but that was pretty much the style of the time.

Just wondering.

BTW the original name of the French film is "Plein Soleil" http://www.imdb.com/title/tt0054189/?ref_=sr_1

Also, I have no idea how they get "purple noon" out of "plain sunlight."

Below is the only image of the boat I have found on the web. Around 2:10 in the video link below there is a good shot of the exterior of the boat.