I am pretty sure it is for one of these machines, or similar (e.g., LC 520), but I am now wondering what would happen if TWO FPUs were popped into an LC.
On the question of the Classic II, does anyone have one of the FPU cards, remember what they look like, or know where to find a photo of the FPU card? I have always assumed that the FPU card stood in the machine vertically, like a Macintosh Classic RAM card. It would be a turnup if this really were for a Classic II, since I also have one of these cards. Mine has a 16mhz 68882 in it.