Object is a board with various components, having 4 18-pin connectors on one side and 2 18-pin connectors on the other. On the component side is a piece of tape on which is written "ENG 1."
Identifying Numbers
Other number
233C
On the bottom right of the board, solder side
Other number
8K X-Y
On the bottom center of the board, solder side
Other number
MAY 3 1972
Stamped on the component side of the board over the Flip Chip marking