There are two modules consisting of a printed circuit board with various active and passive components. At one end there is a white plastic extraction handle, held in place by two metal rivets. On the component side there is one round inspection stamp by the handle, and on the back there are two square inspection stamps.
International Business Machines (IBM)
Printed on the face of the white extraction handle
Stamped in black on the component side below the handle
Printed on the solder side of the board below the handle