A thread in the "Off-topic" section became an "On topic" matter: viewtopic.php?f=30&t=2157 ; I have decided to open this new thread so that the discussion can be continued at the right place.
According to the list of types in the appendix of the book by Hucke and Kruta, the T65 was a study for a single cylinder engine. However, the code T65 has also been assigned to the drawings of an "egg" shaped car:
There is a model by DTD on this car:
And this "egg" car was also the subject of the Newsletter 16 of the Bugatti Trust:
It can be read on the drawing: 4 cylindres, 1.714 cc. Therefore, this is not a single cylinder project. Is the "egg" really the T65?
According to J.J.Horst: "As far as the "egg", the bus and the truck; I believe none of them have type numbers. The egg is a sketch by Jean, may have been for a small car competition that ran in France before the war."
The discussion can be continued here.