Tiberius II Constantine - AE Decanummium, 578-582 AD. Antioch
Size: 17mm Weight: 3.64 grams
Obverse: . ..ANT.., illegible legend, crowned, mantled bust facing, with cross on crown, holding mappa and eagle-tipped sceptre
Reverse: Large X, ANNO to left, cross above, VII to right, Q-shaped e below.
SB 457, MIB 59.
Thanks to Dane Kurth for the identification!