Justinian I (527-565) AE Decanummium (Bronze, 4.16g, 18mm) year 30 (556-567)
Obv: X letter (mark of value?) engraved over hardly visible: D N IVSTINI – ANVS PP AVG Diademed and draped bust r.
Rev: ANNO – XXX Large I surmounted by cross; in exergue, CON.
Ref: Sear 167