8 Bit BCD or Binary Counter 4225D system building block
Digital Equipment Corporation (DEC)
||Printed on the solder side of the board
||Stamped into the front of the aluminum frame
overall: 1/2 in x 7 in x 4 1/2 in
The board is cover with various active and passive components, surrounded by a blue plastic 22 pin male connector. On the component side in the corner there are two triangular inspection stamps.