nothing special, but I don't catalogue too many Byzantine coins, so I figured I would post this. It looks like it was overstruck.
Constans II
A.D. 654- 659
Ӕ Follis 23x26mm 3.8g
OBV: to l. Constans holding staff; to r., Constantine IV.
REV: monogram.
In ex. SCL Syracuse mint
Dumbarton Oaks 180