Item N°42 of the Altaya/IXO "1/43 Main battletanks of the WWII" - Flakpanzer 341 "Coelian" prototype with mockup turret.

"Flakpanzer Coelian was a self-propelled anti-aircraft gun design by Rheinmetall during World War II for the German armed forces. It was intended to be armed with two 3.7 cm FlaK 43 gun in a fully enclosed, rotating turret on the hull of a Panther medium tank but was not built before the end of the war in Europe." (Wikipédia)