Gratian. AD 367-383. ‘Medallic’ Æ (22mm, 4.26 g, 12h). Treveri (Trier) mint. Struck AD 367-369. D N GRATIANVS P F AVG, pearl-diademed, draped, and cuirassed bust right / GLORI A ROMA NORVM, two-turret camp-gate with S between its two turrets; SMTR. RIC IX 29d; LRBC 91. Dark brown to black patina with some light earthen highlights/deposits. EF. Very rare.

The authors of RIC note (p. 4) that “the mint-mark SMTR can be dated to the period between the elevation of Gratian and the completion of the senior emperor’s quinquennium in Feb. A.D. 369. Most of the coinage is commemorative of these important events...” This very rare type was struck for Valentinian I, Valens, and Gratian only at Trier, and an extremely rare issue at Constantinopolis for Valens, where he resided at the time.