What is that guitar?

Updated
Fred P.

I was watching the documentary on the "Rammstein in Amerika" blu-ray and noticed this photo of Richard with this guitar. It seems to be around the Mutter era. It has the R+ cross inlays but the KH-style headstock but with 7 strings (he was playing a KH-2 and a KH-4 at the time). Anyone has more info about this guitar? Could it have been an early RZK-I prototype?

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