It is transitional. Note the three separate tail feathers which show much better on tetradrachms but those always seem too round for this thread. Compare: https://www.cngcoins.com/Coin.aspx?CoinID=108140 Obols seem a lot more rare than tetradrachms.
Under the Byzantine empire the emperor Justinian (527-565) made some very large diameter copper coins, 40 mm and up in the reform of 538 and then with declining diameters throughout the rest of his reign and the next reigns. By the time of Justinian II (685-695 and 705-711) the coins were enough smaller that old big ones were being cut into quarters to serve as flans. Sear 1262. Justinian II, first reign (The story of how he managed to have two reigns is fascinating). Look at the shape and you can see how it is a piece of a larger coin chisel-cut into four quarters.
What we need now is someone to post the other two quarters to assemble our pie. I find it interesting that both our coins show the reverse as upper right quarters but the obverses were opposites. I really would like a Constantine IV large follis of the type that provided these flans but I suspect most of them were cut.
I've got a couple of odd ones - both Ancient and medieval Okay, so both English coins (6&8) are a result of damage, but still really odd looking.