Developed on the basis of the obsolete R35 and S35 vehicles. The simple design allowed the open cabin with a British 17-pounder gun to be mounted on the chassis. However, the project was discontinued during the design phase due to a shortage and obsolescence of pre-war chassis, as well as an ineffective and unconventional gun.
The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.