Diode unit 4143 B system building block
Digital Equipment Corporation (DEC)
||Etched in solder at the insertion end of the board
||Stamped into the front 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 a red sticker label on the side of the aluminum frame that says, "model 4143 7/ 12/63."