Por el retrato, yo creo que es del papá, Constantino I y de la ceca de Arlés 1ª oficina:
Constantine I, AE3, Arles. 330-335 AD. CONSTANTI-NVS MAX AVG, rosette-diademed, draped, cuirassed bust right / GLOR-IA EXERC-ITVS, two soldiers holding spears and shields with two standards between them, with long rectangular banners. Wreath in upper centre. Mintmark PCONST. RIC VII Arles 370.
http://wildwinds.com/coins/ric/constantine/_arles_RIC_VII_370.jpg
Un saludo
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"Qvod tibi fieri non vis, alteri non feceris"