Marie (Myriem Roussel) stops at a  Lancôme counter to check some cosmetics. She wants to try some lipsticks: the ones on the right are standard testers, while the ones on the left look more interesting.

I personally have no memory of  Lancôme stylo lipsticks, but I’ve found some evidence of their existence. The first (bad quality) picture shows the exact lipstick seen in the film, with the brown/marroon tube. It was called Stylo à Levres and was launched in the late 1970s.