If (as seems) it is as shown in this PDF then it certainly has C, B-flat and A-flat rows. That is already remarkable, having keys two steps apart on the circle of fifths rather than one step apart. And whatever the logic may have been for the other rows I can't fathom it. I could be tempted to buy it with a view to modifying it as Steve has his, but I suspect I would never manage to work out a good arrangement, and it's better really to leave it as built. I wonder: does that layout bear any resemblance to any of the big square German boxes?
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