Comparing: M4A3E2 Sherman Jumbo vs. Pz.Kpfw. IV Schmalturm vs. Pz.Kpfw. V/IV Alpha

The heavy-armored assault variant of the M4A3(75)W. The vehicle featured additional 38-mm armor plates, enhanced transmission compartment hatch, and a new turret with enhanced armor that was developed on the basis of the T23 turret.

In November 1944 the Krupp company presented several avant-projects aimed to upgrade armament of tanks and tank destroyers in service. Among them there was a project of mounting a Panther's Schmalturm (tight turret) on the Pz IV Ausf. J. The project was canceled due to phasing out the Pz IV production.

Only one prototype was built. The Pz.Kpfw. IV turret was mounted as a stationary module on the Panther hull for testing.