Any thoughts...?  PC Creations PCC-5-10L.  I tried to take a photo of the connector (there's no other interface that I can see) because it looks like some sort of disk controller - 14-pins.  Dated July 8, 1985.  PC Creations was a Detroit company started in 1985 so this was likely a flagship product.  However, I have no idea what it's for.  I also found a TRS-80 Deluxe Joystick, which I will try to figure out if I can use somewhere.