I more or less finished my 1973 GJ
this morning. As you can see, originality is not very important to me. As you also can see, to get it together I put on a used chain that is several links too short! I also need to get the right Huret-specific washer for the rear derailleur. The only other change I am likely to make is to swap the Campagnolo Front derailleur with a nice Huret model.

Also, to my relief, the Weinmann Vainqueur brakes work quite well, very much like a nice set of Mafacs.