Interesting info here.
I cannot vouch for it being accurate but I have met the guys (local to me) and they seem to know what they are talking about.
https://www.driven2automotive.com/blog/ ... gust-2017/
How to spot Fake NGK Plugs
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Craig T
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TallyB
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Re: How to spot Fake NGK Plugs
An interesting source of info to have at hand. 
There is no such thing as bad drink, just some better than others.