The Panther II mit 8.8 cm KwK 43 L/71 is fake tank that has continued to appear in media for a number of years. Such a vehicle never existed.
Panzer V Panther (Family) - War Thunder Wiki
ArtStation - Panther II E-50 Turret 8,8 cm KwK 43-1
How common was the PzGr 40 Tank Shell in WW2? - Quora
RFM Panther Ausf F Work in progress - WWII Axis - KitMaker Network
Panther tank - Wikipedia
WW2 German Fake Tanks Archives - Tank Encyclopedia
WW2 German Fake Tanks Archives - Tank Encyclopedia
WW2 German Tank Destroyer Prototypes Archives - Tank Encyclopedia
Panzer V Panther Ausf.D, A, and G - Tank Encyclopedia
WW2 German Fake Tanks Archives - Tank Encyclopedia
German armour: Tanks, self propelled guns and armored vehicles (1933-1945)
オープニング 大放出セール PANTHER2 帽子
Hypothetically speaking, how dominant would the Tiger I have been if it entered service with the 8.8 cm KwK 43 L/71 seen on the Tiger II? How about if the Tiger II
オープニング 大放出セール PANTHER2 帽子