Looks to me like it has a turret on its turret.
Mind
Blown
US M3 Lee, circa 1940:
Known nowadays as a *commander's cupola,* the M48/M48A3, M60 and M60A1 tanks in which I crewed had them, with a .50 M2 usually mounted, usually inside, where the TC was not exposed to fire when the 105-round ammo belt went dry after about ten bursts. The Israelis found that when a High Explosive shell hit one, it usually blew the cupe off, sending the top half of the tank commander along with it- and when they rebuilt our '48s and '60s into Magach 7s and 8s, they left the cupolas off but mounted a .50 coaxially over the main gun tube.