I'm not sure, but I can tell you that I am restoring a 531 Puch (I suspect late 70s) for a friend and it has Normandy Luxe Competition red label high-flange hubs. The dust covers are red plastic. Other original equipment on the bike are Suntour Power Ratchet DT Shifters, Sugino Mighty Tour crank and Suntour Cyclone GT RD and Cylone FD. The other parts may help you date the hubs. I haven't overhauled the hubs yet. Is there any markings on them helpful in dating them?