Under the protective layer on the solder side of the board
overall: 3/8 in x 4 1/2 in x 7 1/2 in
At one end there is a gray plastic connector. There are several integrated circuits and other components on one side. "C.E." is handwritten in the corner next to the extractor levers. On the other side the circuit is visible. "1983" is also printed on the front of the board.