This is a B169 module with a green board and a blue plastic extraction handle, attached by two rivets. The module is marked by three inspection stamps. "W" is printed in red several times throught the board. "Inverter B 169B" is printed on the solder side.
Digital Equipment Corporation (DEC)
Stamped in white on face of extraction handle
Printed in silver on reverse side of substrate parallel to left-hand edge