Did anyone find a picture of the case? I'm really curious about it.
I have seen those keycaps on
Cherry G80-0662 keyboards. It seems that the G80-0350/e is an earlier version of the G80-0662, or a version of the keyboard embedded in a larger industrial machine.
I used to own the G80-0662 version with the flipped keycap colors (brown on beige).
Click here for some picturesA friend of mine had the Beige on Brown keycap version (like the one on eBay):
Sadly, without extensive modifications, you cannot get these boards to work with modern computers as they seemed to come only attached to industrial machinery.
Also, they have
Cherry M8 switches which I personally dislike.
The keycaps are spherical, Cherry-MX compatible, but they are slightly shorter than SP DSA caps.
Here are some images on keyboards together with DSA capsI hope that this will answer your question and any other questions you may have had