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I'm guessing it's the FD ABS system, but then again it might not be. I know it says Nippon ABS ltd. on it but i want to be 100% sure thanks. It was in a box of parts the old owner of my car gave me.
In the parts manual(by the part number in your pic), it's shown in hatch area and is described as Box, Control - A.B.S. So it looks like the ABS control box