Watch List notes:

Justinian I (527-565). AE Half Follis. Sicilian mint(?) Dated RY 15 (541/2 AD). Obv. DN IVSTINIANVS PP AG. Helmeted and cuirassed bust facing, holding globus cruciger and shield. Rev. Large K between A/N/N/O and XV; above, cross; in exergue, CON. D.O. 313 (Constantine in Numidia); MIB 243; Sear 285 (Constantine in Numidia). AE. 7.19 g. 21.00 mm. Nice green patina. Good VF.

Constantine in Numidia has been suggested as a mint, as well as a location in Sicily. It may in fact be a mobile military mint, staffed by mint workers from Constantinople and Carthage, and setting up wherever the need for coinage was greatest.