This is the hull of the Begleitpanzer 57 also known as the Bagelpanzer. It is an slightly modified Marder chassi with the only upgrades being a larger turret ring to fit the larger turret and some strucural reinforcements to support the larger gun. It was used in the Begleitpanzer 57 project due to the Marder being the newest IFV in the German army.

