A 155-mm SPG design project developed in 1955. The vehicle was intended to be manufactured on the chassis of the U.S. M47 medium tank, which was exported to France. However, the chassis of the French medium tank Batignolles-Châtillon 25 t was preferred over other variants. The initial version existed only in blueprints.
The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.