This S107 module has a green board and red plastic extraction handle. There are two inspection stamps on the component side. On the solder side there is a printed circuit which covers the entire board. "INVERTER R107D" is printed on the extraction end. The handle is held in place by two metal rivets.
Digital Equipment Corporation (DEC)
Found printed in white on face of red plastic extraction handle
Found printed in silver in left toward extraction end on solder side