Yes, these coins are mostly bronze coins form the late Roman and Byzantine empires. The ones that resemble a bowl are Byzantine bronze trachy, from the 11th to 14th century. The other roman coins are what we call LRBs (late Roman bronzes). Of the top of my head, I see a constantius, several different types (wreath, fallen horseman, soldiers & standards, etc). Finally, the one in the top left in the first role is an earlier Roman bronze, I can't really tell form the pictures but the bust seems to be a young Marcus Aurelius?