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.
Manufacturer
International Business Machines (IBM)
Identifying Numbers
Model number
RA 729-2
Printed on the face of the white extraction handle
Other number
458637-1F
Stamped in black on the component side below the handle
Other number
PCB 438636B
Printed on the solder side of the board below the handle