Etched in solder at the insertion end of the board
Stamped into the face of the aluminum frame
Stamped into the side of the aluminum frame
overall: 1/2 in x 4 1/2 in x 7 in
There is an aluminum frame and a blue plastic connector surrounding the board. On one side there are several large components. "Resistor board 1978 C" is etched in solder near the insertion end on the other side of the board above the grid lettered A-Z.