A very nice piece.
Obverse: bust of the empress in drapery and diadem, on a crescent, to the right, in the rim legend:
MARCIA OTACIL SEVERA AVG;
Reverse: Pudicitia seated on a throne to the left, holding a long scepter, surrounded by legend:
PVDICITIA AVG;
Silver, diameter 21 x 22 mm, weight 3.7 g, axis 12 h.