I thought that the quartz ROO uses the same case as the 7750, but I've seen different casebacks.
The interesting (?) think about the dial is that the date window appears to be in a position similar to the LWO (ie slightly more to the centre of the face).
I haven't torn one down yet but have just bought a used one so I shall be particularly interested in the bezel screw set to see how that compares.
I have already seen 3 different bezel screw sets (ROO, Diver and Barrichello) and wonder how many more variants there are - ROOs I have use a 1.6mm hex screw, Diver I have uses a 1.3mm hex screw and the Barrichelo/Montoya use allen screws (not sue what size though). The ROO screw is also longer than the Diver screw.