Watch List notes:

Gratian (367-383), Solidus, Thessalonica, AD 378-383; AV (g 4,44; mm 20; h 5); D N GRATIA NVS P F AVG, Rosette-diademed, draped and cuirassed bust r., Rv. VICTOR IA AVGG, Valentinian I and Gratian enthroned facing, each with r. hand on a globe between them; above, Victory facing with wings spread; palm between; TESOB. RIC 34b.1; Depeyrot 34/1.
Nice portrait, about fdc.