What error is this?

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Este tema se publicó en el foro en inglés.

 Looks like acid damage. Those coins have zinc inside and copper outside, 

so something splashed on it and the copper got eroded. 

N#43 

Token collector [1600-1899] with some coins

What about the striations?

Jamais l'or n'a perdu la plus petite occasion de se montrer stupide. -Balzac

Mr. Midnight

What about the striations?

 

Quite typical for copper plated zinc coins.  https://en.numista.com/forum/topic156307.html#p1221923

oh yes, I thought I had read about that here, did not recall it had its own thread.

Jamais l'or n'a perdu la plus petite occasion de se montrer stupide. -Balzac

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