Are these Byzantine coins cast fakes?

Please forgive what may be a dumb question as I am quite new to telling real coins from fakes. I have heard that casting can leave bubbles and pits. The following coins have really nasty pitting. Are they fake? Or can real coins corrode like this?

 

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Yes, real coins do corrode like that. I can't tell if they're fake or not. But the corrosion looks very typical.

 

They look real to me (struck), but I'd wait for the pros to weigh in.

 

Authentic and patina completely stripped.

 

Good collectible coins, but indeed stripped of their corrosion and patina; hence the pitting.

Frans

 

Authentic to be sure. Not uncommon to see the large bronzes like this, especially after cleaning.

 

Thanks everyone, really appreciate the replies