That looks more like a bolt in the first two pics, and would have left quite a hole....and so close to the sidewall.... Whilst it might still be holding pressure, I'd expect it to lose pressure pretty bloody quickly if you remove the bolt! That tyre is now in heaven.
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Current: 135i Auto, Le Mans Blue - w/ Bridgestone RE-11 rears, GP Thunder 7500k angels, & "golf tee" mod plus a few M3 suspension bits and pieces...
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