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Looks like a manufacturing defect. Some porosity in the original casting. You'll have to be the judge, but I suspect it's been there since the beginning. It's way down inside the cylinder so it will have a minimal effect on compression. I might try to find a single replacement but, if your wear is minimal you'll have a hard time finding a better replacement. I'd be tempted to reuse it.
-Andy
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72 Carrera RS replica, Spec 911 racer
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