A very nice piece of a well-liked issue. Patina.
Obverse: bust of the emperor with uncovered head, wearing armor and paludamentum, to the right, in the rim legend:
M AVR ANTON CAES PONTIF
Reverse: Caesar Caracalla standing left, holding spear and baton, war trophies on right, in rim legend:
PRINCIPI IVVENTVTIS;
Silver, diameter 17 mm, weight 2.8 g, axis 6 h.