According to the book's author, Raymond Dornier, the manufacturer constructed four vis a vis cars by modifying their mobile saw bench. These cars differ in a number of respects from the saw benches in that, inter alia, they lack the saw drive mechanism and uniquely have a black apron fitted at the front between the dumb irons. Other differences include the prominent Millot name in brass mounted on the radiator and at the front, together with both the radiator and fuel tank being made of brass. Other differences include the prominent Millot name in brass mounted on the radiator and at the front, together with both the radiator and fuel tank being made of brass. All others were initially manufactured as saw benches before being modified into vis a vis cars.
The Millot shown in the attached photograph (reg. no. 1898 RV25) also has this black apron at the front, as well as plenty of brass, and is therefore a genuine car.
The photograph submitted by Bertrand clearly shows a Millot vis a vis that has gears at the front for driving the bandsaw.