The module has sockets for 9 vacuum tubes (all present) of varying size. All the tubes are framed by a metal handle. In the chassis there are 11 phenolic circuit boards. The boards are wired to male connectors at the bottom of the chassis. Also printed on the chassis are six inspection stamps reading "K IBM" followed by a three digit number.
Date
ca. Nov 1956
Manufacturer
International Business Machines (IBM)
Identifying Numbers
Other number
002477
Stamped on the chassis
Other number
3087607
Stamped on the chassis
Other number
3087607 002477
Typed on a paper label at the front of the handle
Other number
6543
Handwritten on a round paper stamp on the inside of the module.
Other number
6544
Handwritten on a round paper stamp on the inside of the module.
Other number
6545
Handwritten on a round paper stamp on the inside of the module.