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It's a pretty common sort of layout that was favored by a lot of clones so it might be hard to pin down, but here's some suggestions that might help you (or someone else) track it down: IBM 5170 Sho-Tronics 88-10 Leading Edge Model D

Ha! I literally have all three of those in my collection. The case I’m looking for has a somewhat unique design for that era in that the top of the case isn’t a metal shell. It is a flat plastic lid. The bottom, back, front and sides are one piece.