That's a Panther II. Had the KTs 88mm L-71 gun, KT track and running gear, rangefinder and the schmallturm. Armor was beefed up 25mm all inside. None ever entered combat....all captured at the end of the war without any turrets being married up with the chassis other that one at Kassel for trials. The Brits captured the turrets and US forces got the chassis plant. Pnly one existing turret and that was shot up at Bovingtron before anyone realized what it was. A Panther II chassis is at Ft knox Museum with a Panther A turret on it.