The project was called the TPV -- "Toute Petit Voiture" or very small car -- and trials continued until 1939, when Boulanger declared his car ready for launch. Unfortunately, it wasn't.

The TPV, with its flimsy aluminium body, erratic water-cooled engine and soft, saggy suspension would have been a disaster for Citroen, but Boulanger ordered 250 cars to be assembled for the 1939 Paris Salon. Production started at midday on 2nd September 1939. The next day, France declared war on Germany, the country mobilised, and the curtain came down on the TPV with just one car completed.