According to the in-game armor viewer there does not appear to be any armor underneath the lateral turret overhangs. The armor for the turret side is present and the armor for the sloped upper side hull is there, but there is a gap where the turret sticks out beyond the flat top of the hull where no armor appears. I don't know if it's just a display issue or an oversight in the armor model.
Also, this tank really sucks. The gun is absolutely horrid.