Ddaddy
Just doing what I do
That looks like a true factory 5 pin box to me based on what I have been finding.Maybe not know this was true nos from a closed dealership when I got it.
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Black surround for the electrical plug, ink stamped numbers on the face next to it, Gold heat sink with secondary engrave around it, with an RCA transistor cap.
The only thing I can’t see is the decal on the side.