Years ago in rural France

Could be, Bertrand. As said above, there is still a garage today at n°18 of the rue de Verdun, so some business is still there. But that doesn't help to know which garage it was in 1988, and why they were servicing "exotics" that seem to have come from every part of France, what kind of service it was...interesting matter.
Rgds

 

I think that in that time (70s-80s) there were hardly any specialist around, so when someone maybe worked on exotica few times a months was soon a specialist in that field. I guess the location was not important and assume still is. If I look where specialists started in Holland, there was no logic in terms of location or nearby dealers. Fascination it remains!

 

Could be, of course; except that Saint-Dizier isn't exactly bristling with transportation solutions: in the eighties, once you have left your car there for servicing, and taking as an example the Lamborghini registered "33", going back home to Bordeaux would have been a real expedition: going to Paris (by train?) then changing train stations by tube from Gare de l'Est to Gare d'Austerlitz, then taking a train to Bordeaux (and there weren't that many trains from Paris to Bordeaux) then five hours of train, then commuting to your home.. .it would have taken you the best part of a whole day. And there were many good, reputed, body shops around Paris, which are much easier to access (Lecoq, for instance, but there are many others.).
And why would someone owning a Lamborghini Miura in Nice or around ("06") travel 650kms to Saint-Dizier (more or less in the middle of nowhere) to have the car serviced there, as there are very good, reputed shops for Lamborghini service in Italy, that is less than 50 kms from Nice? Sant'Agata Bolognese itself isn't even that far...
Intriguing, to say the least.
Rgds