I'm hoping an expert in this area can help me pin down which mint produced this coin. Thanks in advance. And feel free to post similar coins or whatever you feel is relevant! Constantine II as Caesar, AD 317-337 Roman billon centenionalis, 2.84 g, 17.2 mm, 6h Uncertain mint Obv: CONSTANINVS IVN NOB C, laureate, draped and cuirassed bust, right Rev: GLOR-IA EXERC-ITVS, two soldiers standing, two standards between them; ??? in exergue The exergue in hand looks like unknown character, S?, M? Delta/A???