A nice piece.
Obverse: bust of the emperor in radial crown and armor, to the right, in the rim legend:
IMP AVRELIANVS AVG;
Reverse: Sol walking to the left, holding his hand in a gesture of salutation and a globe, with captives at his feet, surrounded by legend:
SOLI INVICTO, in section XXIS;
Silver coinage, diameter 21.5 X 22 mm, weight 4 g, axis 6 h.