Constans II and Constantine IV, AE half follis, Syracuse. AD 641-668. 17mm, 1.67 g

No legend, Constans, crowned and draped bust facing with long beard, and Constantine IV, unbearded, crowned and draped bust facing.
Large K, cross over AN in left field, NOZ in right field. No mintmark. 

SB 1114a; MIB 213.
Very rare with NOZ.

With permission of cngcoins.com, auction 473, Lot 394, July 2020.