Development of the vehicle started while France was still occupied by the German forces. It was an attempt to use the obsolete B1 Bis chassis and fit it with a modern, more powerful gun. The project was finished by the Atelier de Construction de Rueil Design Bureau. A total of 60 vehicles were manufactured. However, the tank was considered unsuccessful compared to similar foreign vehicles.
Time for the successive autoreloading of each shell into the magazine.
The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.