Turns out, its a M35 KM!

[Schwerpunkt]

From what I understand, an easy way to tell if it's a KM decal is if you can make out the border around the eagle.
If you can still make it out with a worn or painted over decal that is.

Here is my ET with dark grey/black overpaint.

Attachment 916997
Attachment 916998
Attachment 916999

That's clearly a Heer.

[MoparJW]

That's clearly a Heer.

What made me doubt is that it looks bright gold in direct sunlight, like in the pic, and dark in indirect light.
But I trust your expertise on this, and as long as it's 100% original is all that really matters to me

Sorry for the hijack OP