Unfortunately, the legend is off the flan at a crucial place. 15.5 mm; 1.38 gm Constantinople mint Obv: CONSTAN____S PF AVG, rosette diademed head, r. Rev: GLOR-IA EXERC-ITUS, two helmeted soldiers with standard between. CONS(?) in exergue. RIC viii, p. 449, 24 or 27?
Obverse lit from a different angle and with some photo processing to improve the legibility of the legend.
A combination of expected letter spacing and style leads me to guess Constantius II. Coins of Constantine II as Augustus are les common since he died not long after becoming Augustus. The portrait looks more like Constantius II.
Thanks all. I just noticed I typed the obverse inscription wrong (should have DN before CONSTAN...). Back to RIC, I guess!
If it helps it looks very similar to one of my coins. Only a few minor differences, so maybe just a different mint? Constans, AD 337-350 Æ17, 1.7g, 12h; Siscia mint, AD 337-340. Obv: CONSTAN-S P F AVG, rosette-diademed, draped and cuirassed bust right. Rev: GLOR-IA EXERC-ITVS; two soldiers holding spears and shields with one standard between them, Chi-rho on banner // BSIS dot in crescent RIC VIII 99, p. 355
