This is a tiny little coin but generally well-preserved. The only problem is that there are some encrustations on the reverse which obscure the mintmark. I think it's SMKB, from Cyzicus, but wondered if you guys agreed. Gratian, AD 367-383. Roman Æ half centenionalis. Cyzicus (?), AD 383. 0.91 g, 14.2 mm, 11 h. Obv: D N GRATIA-NVS P F AVG, diademed, draped and cuirassed bust, right. Rev: VOT / XX / MVLT / XXX in four lines, all within wreath; SMKB (?) in exergue. Refs: RIC ix, p. 244, 22a; LRBC II, 2552; Cohen 77; RCV 20161.
Looks like Cyzicus.... Gratian, AE 2, 24 mm 6.3 grams, Siscia mint Obverse, diademed and cuirassed bust Reverse, REPARATIO REIPVB, emperor crowned by Victory and holding globus raises turreted woman