That's going to be tough because the last of the old days Bol d'Or at Monthlery was in 1960 (won by Maucherat and Vasseur on a BMW R60), and only came back in 1969 when Rougerie-Urdich won with the new Honda CB750R if I recall correctly.
So, there were no endurance races in the whole of France between these years, the only one being a yearly 6-hour one-driver endurance contest for the 50cc "Sport" class on a road circuit south-west of Paris, called "Les 6 Heures de la Petite Cylindree".
As far a world records (endurance and others), there were plenty of attempts at Monthlery during the 1960s, but mostly for... 50cc bikes. Kreidler, VAP, Mondial...
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On the Monthlery track a french team, beat the 12 hour record now averaging 113 km/h.
Engine : Vap Sachs. Driver: Jean Pierre Beltoise.
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November 64 at the Monthlery 2,5 km oval, Kreidler turns up with a strong team, determined to set new records.
Drivers: Hans Georg Anscheidt, Rudolph Kunz, Cees VanDongen, and spare Claude Vigreux, who was needed when Kunz chrashed during practice.
The bikes had special fairings and the dual carb GP- engine was optimised for high speed.
They went home with 8 new records, some of them beating both 50 and 75cc records.
(courtesy
http://www.elsberg-tuning.dk/recordbikes.html)You have to begin searching for links because there is little available...
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A great site for general info (to which I contributed the little knowledge I have) but so far nothing about records, and only first placing are posted, no 2nd, 3rd etc. Also little or no photography.