Interesting error of not stamping / very shallowly stamping one crosspiece of the letter X, or firmly clogging the stamp. A rarity among 1st century AD Roman coins.
Obverse: Bust of the emperor wearing a laurel wreath, to the right, in the rim the legend IMP CAES DOMIT AVG GERM P M TR P XIIII
Reverse: Minerva standing left, holding a bundle of thunderbolts, spear, shield at her feet, in the rim legend IMP XXI COS XV CENS P P P P
Silver, diameter 19 mm, weight 3.30 g.