The object is a module with nine tube socket positions, all of which are populated. Positions 1-4 are medium sized tubes, 5-8 are small and position 9 is even smaller. The sockets are framed by a metal handle. Below the sockets is a chassis holding 11 PC boards with passive components. The PC boards are connected to three male parallelogram shaped connectors at the rear. There is one inspection stamp on the top center of the frame.
Date
ca. 1958
Manufacturer
International Business Machines (IBM)
Identifying Numbers
Other number
3087051 000371
Stamped on top center of frame in black ink
Other number
6087 6088 6089
Written on white circular label on left inside of handle
Other number
D 3087051 000371
Printed on first line of paper label on front of handle
Other number
XB B02 K W
Printed on first line of paper label on front of handle