This is a B163 module with green board and a blue plastic extraction handle attached by two rivets. The componenet is marked faintly with a single inspection stamp; "DIODE GATE B163D" is stamped in silver to the right on the Module's reverse side. There are red "W"s printed throughout. At insertion end there are ten holes unfilled by wires.
Digital Equipment Corporation (DEC)
Stamped on left side of the back face of substrate