A very nice piece.
Obverse: bust of emperor wearing laurel wreath, armor and paludamentum, to the right, in the rim legend:
IMP MAXIMINVS PIVS AVG;
Reverse: Pax standing left, holding olive branch and long scepter, surrounded by legend:
PAX AVGVSTI;
Silver, diameter 19.5 mm, weight 2.98 g, axis 6 h.