Dual sense amplifier 4554 A system building block
There is an aluminum frame and a blue plastic connector. "Dual Sense Amplifier 4554 A" is etched in solder at the insertion end. On the component side there are two round inspection stamps.
Digital Equipment Corporation (DEC)
||Etched in solder at the insertion end
||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