"Edge Detector" is printed in white along the extraction edge of this printed circuit card. There are two rivet holes at the extraction end. Between the rivet holes there are three stickers. One yellow, one blue, and one white sticker with "1691/" handwritten on it.
Xerox Data Systems, Inc. (XDS)
Printed in white at the extraction end of the component face
Printed in white in the extraction end corner on the component side
Assembly number fount printed in white at the extraction end of the component face
Stamped on the solder side at the extraction end.
Copyright number printed in white toward the insertion end on the component side