Germany
Could you find photos of the OKW ones? I haven't been able to and that's why i think they're not historical.
The Original Ardennes Forrest Pattern:
Germany January 6th 1945, a german Panther tank is passing anti-tank obstacles of the Westwall near Weissenburg/Bergzabern
Sorry, I don't agree with the last point. I think they can be historically accurate because units tended to paint their vehicles the same way and if there's a photo of it, then it existed.
Evidence i. e. Striped Camouflage:
Germany February/March 1945, Unit of Panther Ausf. G at Ortwig near Küstrin.
in Combat:
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cblanco ★ 
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VonManteuffel 
Heartless Jäger 
