I did a cursory Internet search and have found comments that this particular model is somewhat scarce or rare. One is somewhat skeptical when seeing such remarks, but such remarks have come up often enough to ask if anyone out there knows about this model.
All C128Ds in USA are metal cased. It is rare in Europe where the vast majority of them are plastic cased. Naturally selling an NTSC machine to Europe is rather futile, as the games and demos people want to play and see over here will not run on it.