Constantine IV Pogonatus AV Tremissis, AD 668-685. 14mm, 1.37 g. Syracuse.

Constantinople. 
DN CONSTANTINYS PP AV, pearl diademed, draped, cuirassed bust right.
VICTORIA AVGY I, cross potent; 
Gamma dot in right field.
Mintmark CONOB.

MIB 41: Sear 1205A.

With permission of Roma Numismatics, Aug. 2015.
Estimate: £250.