What I find interesting is evidence of how long those coins remained in situ--you can see patterns of wood that decayed against a few coins. It's probably safe to say they were never cleaned. I hope you'll find a way to safely remove encrustation--and that details remain.
I can see the head of a Roman Emperor on #3. It is probably an AE3 of Constans, Valens, Valentinian or another emperor of the 4th century. Once you clean it, it might look similar to like this one. You can use olive oil and/or distilled water to clean them.
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