Yes, so far as I know from my reading, the earliest cast-hull M4A1s did not have the side armor or turret armor plate. However, I believe the plate could have been added in the field, but I would not know how to verify it. To me, the cast-hull Sherman is the quintessential Sherman, my favorite since I saw the Revell or Monogram model as a youngster. The old Mato Sherman has the cast hull, but a monster turret.
