First one was in a folder with Roman coins. Annotated as Tibeius Constantine 578-582 AD 5N O: His bust r R: U SB 438
Second one is a very small coin (which accounts for the fuzzy pictures), annotated as Miletus, Ionia 478-390 BC / Forepart of Lion / Star in Incuse Square / Diobol
AE means bronze, and 12 means the diameter in millimeters, except annoyingly on some later Roman coins where AE1, AE2 and so on are separate labels for different sizes of coins.
i really like that maurice tiberius pentanummium. I wasn't familiar with the type, and looked at a few on vcoins. yours seems to be in good condition for the type.
For Roman coins the size is AE1, AE2, AE3, AE4 which denotes a range of diameters. See RIC for the ranges. For Greek coins it is AE then the diameter in mm. Hope that clears up your annoyance. AE is short for Aes which just means bronze in Latin.
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