This circuit board has a round black inspection stamp over the left extraction end hole. There are several numbers printed in gold around the printed circuit on the component side.
Manufacturer
Digital Equipment Corporation (DEC)
Identifying Numbers
Other number
001971
Found printed in gold in right extraction end corner
Other number
460
Fot side of moduleund printed in silver in extraction end lefthand corner or circui
Other number
758
Found stamped in black on gold sticker in left corner of component side/ extraction end of module
