"Ampli Boucle No.3" is printed in white on the component side of thie printed circuit card. At the extraction end of the card there are two inspection stamps - one triangular and one round. There is one round inspection stamp on the solder side.
Xerox Data Systems, Inc. (XDS)
Printed in white at extraction end of component side
Printed in silver on solder side
Printed in brass at extraction end of component side
Assembly number printed in white at extraction end of componenet side