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The black lines on the neck poket.

I'm just curious what is the black line line on the neck poket?
Why is it there?
 

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In manufacturing environments , when there is a specific defect or condition that is being sorted for or checked , a “witness mark” is often used as evidence of inspection. This might be the case.

QC is done by sampling, so most of the goods that reached the final consumer have never actually been in the hands of a quality inspector - including cars!! (that’s why I find those “how did this make it through QC?” Comments so amusing).