First the "'ST3 "'turret ( " Schneider Tourelle 3 " ) had been tested in 1933; then it was considered to use the "'ST2 "', then seen as a possible standard turret for all heavier tanks, but finally a choice was made for the "'APX1 "', originally developed for the Char B1, costing ?200, 000 which brought the unit price to ?610, 000.
