A very nice piece.
Obverse: bust of the emperor in radial crown, armor and paludamentum, to the right, in the rim legend:
IMP GORDIANVS PIVS FEL AVG;
Reverse: Emperor standing right, holding spear and globe, surrounded by legend:
P M TR P IIII COS II P P;
Silver, diameter 22 mm, weight 3.32 g, axis 12 h.