Dan,
Just a guess, really. That is a bit wide/overkill for 6.5x9, but I have seen (and even bought on one occasion) mis-labeled 9x12 cameras. Don't worry, I'm over that obsession now. These days I buy 8x10 cameras!
I'd have to check to be sure but just about every German 9x12 camera I own came with either a 15cm, 13.5cm or, in one case, a 12cm lens. An 8cm lens would be a rarity but not impossible, I suppose.
The aperture scale on the shutter seems to go to f/6.3, so if the lens is marked f/9 then someone may have put new cells in the existing shutter. Although there was a f/6.3 version of this lens:
http://photo.net/large-format-photography-forum/00RbKf
Jonathan
EDIT: The German auction site is dangerous for those who collect these cameras. I had to force myself to stay away from there for fear of going broke. My wife collects Wedgwood china and most of the good stuff, understandably, is in the UK. Often she pays more in shipping than she does for the merchandise.
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