I don't know, and the 90s were kind of a tough era. It seems the actual OEM hardly ever dared attach their name to the product. Pick up any case or 386/486 motherboard and try to find their name. 😉 Things got better with the likes of InWin, Enlight -- both in terms of case quality, and traceability.
Hope you find it, though. That's a nice looking case -- very clean and dignified design. If you haven't yet, try searching for "(vintage,retro,beige) case -raspberry -rpi" on ebay under the Computers and Accessories category. Save your search and keep checking. I've found almost all of my old cases over the last year or so.