Peugoet used french treaded bottom brackets which are now obsolete. Not sure if they switched by 83 or not. I have an older Peugoet frame, 70 something, not quite sure of the year. It uses a french bottom bracket, it's screwed and I still havent' figure out what to do. There are some expensive options to convert the bottom bracket to a more modern one, or you can just rebuild it using French parts.

Hopefully someone will be able to help you better.