Looks more like environmental staining to me. What's the weight? If the weight is normal, then it's just stains. If the weight is lower than normal, then it's a missing clad error. https://www.error-ref.com/missing-c...ing-rolling/
It is a stain of some sort. If it was missing the cladding, it would not be showing the nickel through on the high spots plus it would be showing more of in a straight line.
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