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Real or re stamp?
I'd say re stamp. Factory stamps are done with the distributor held in a jig and would not necessitate a re stamp. It almost looks like D2OF. But I don't see any sanding of the # pad which is what some scammers try to do when doing a re stamp. Then sand down most of the Eng. # but leave tell tale signs of the original# then stamp over it. Don't know why they tried to stamp over the Z. Date code is a little sketchy too. Maybe sone else can chime in on this one. Heres a re stamp below.
Looks like a just plane sloppy stamping. A bad day on the distributor line.