The object is partially encased in a metal frame. It has discreet components only (no integrated circuits). It has male connectors on both the top and bottom. Etched in solder on the solder side is "ARITHMETIC BUS DRIVER." Written on a piece of tape attached to the bottom of the component side is the capital letter D.
Digital Equipment Corporation (DEC)
Etched on the metal frame on the left side of the object
Etched on the metal frame on the right side of the object