Hi Monika. I'm split between 2 possibilities. First, severe die polishing due to a clashed die with the reverse die being changed. Second, defective metal strip making planchets look striated.
Hi Monika. I'm split between 2 possibilities. First, severe die polishing due to a clashed die with the reverse die being changed. Second, defective metal strip making planchets look striated.
These are generally identified as "roller marks" from the rolling mill. Another possibility is striations from a rotating descaling brush applied after rolling. No conclusive explanation has been produced to explain this effect.
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