Hi everyone,
New to the forum and tried using search but i thought you dont mind if i ask in a different thread. Because i dont know much about bikes and what i know i just googled so its a bit confusing. I got muself an old bike. Its centurion lemans mixte. Its in a very good condition, seems to have most of the original parts and rides well. But id like to know when it was made (maybe late 70s?) and is this bike worth anything?

ive read they have serial numbers with the date it was made, but i cant find any.