Can anyone explain these die stamps on my E88 head? - Engine & Drivetrain - Classic Z Car Club Skip to content

Can anyone explain these die stamps on my E88 head?

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As the title states, I've noticed quite a few non-factory appearing stamps on my '73 E88 head. I'm assuming they're not factory, but could be?

Funny, the one on the back (JW 207) are my initials and the area code of my childhood hometown.

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