I called NGK and gave the numbers on the plugs. He told me wgat plant and when made amd if real.
Also said they do not copy-fake copper or nickel one's. But plenty of fake iridium ones.
To buy from a real place. That Summit Racing is authorized source, and Rockauto gers them from one and is also safe.
I like how the coating NGK puts is easy to read.
Ford spects NGK so does Honda. The Honda small engine stuff i have us Ho da boxes with NGK
If i can't get NGK it is Autolite