I'll describe a logo of a certain carmaker and your job is to guess what brand it represents. If it takes too long, I'll start posting photos.

Description:
A black prancing horse on a yellow background.

HINT 1:
This carmaker in question cooperated with Fiat on some of its models. No, it's still not Ferrari.

HINT 2:
The brand in question comes from Germany.

HINT 3:
I painted over some bits, but that's the logo in question:

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lonestranger got it right. It's Steinwinter.