IBM 1620 modules
The object consists of two 492947 IBM 1620 modules. Each has a large heat sink on the component side.
International Business Machines (IBM)
||Stamped into the righthand corner of the board
||Stamped into the edge of the component side of the board.
||Stamped into the bottom of the component side of the board and stamped onto the side of the original box.
||Printed on the solder side of the board
overall: 1/2 in x 2 5/8 in x 4 1/2 in
Gift of Dave Babcock