Dux Buno Mathsson frankenchair?  

I came across this bizarre Dux chair and my suspicions are that someone pieces a Dux Karin chair with a black wood frame. Although it works visually and all pieces appear to bolt in securely via Allen wrench hardware, I have never seen this model. I could easily be proven wrong and thought the community may be able to help.

Did DUX ever make a ebonized oak version of the Karin or do I have a well thought through Frankenchair? 

Thanks in advance. 

note: I am a dealer, always learning and growing my knowledge. if that stops you from responding, no biggie 😎