This is what Hammond have to say about it:
We thought about calling this the “Have Your Cake And Eat It, Too” but that would look silly on the back.
We agreed on calling it the HAMMOND Sk2 and when you play it you’ll see that first name is indeed appropriate.
For many years, HAMMOND has been asked to make a truly portable double 61 note instrument that didn’t share the gross weight of a Refrigerator.
The Sk2 can do it all. HAMMOND Drawbar voices up top, Grand Piano on the bottom-or vice versa.
Manual Bass and Organ comp on the bottom, Horn section up top for accents.
And yes, you can play the Sk2 as a double manual HAMMOND Organ in the traditional fashion, the Pipe Organ voices, too.