What model/make are this Freewheel and Freehub? I am in the process of overhauling my old Motobécane racing bike and I'd like to replace the freewheel, if reasonable. However, there is no indication of who made it (the bike shop couldn't help) and I've never seen a hub like this online.

The Freewheel has a lock ring with splines on the outside and I'm wondering which tool to use to screw it tight on the hub.
It looks like a Helicomatic. Once you know the name, there is plenty of information on the Internet.