Nero Claudius Drusus. Died 9 BC. Æ Sestertius (36mm, 25.34 g, 6h). Rome mint. Struck under Claudius, AD 41-42. Bare head left; c/m: NCAPR (Nummus Caesare Augusto PRobatus?) within rectangular incuse / Claudius seated left on curule chair, holding branch and resting hand on lap; weapons and armor on either side of globe beneath. RIC I 93 (Claudius); von Kaenel Type 57; for c/m: 60. Brown surfaces, some roughness. Host coin: Near Fine; c/m: Near VF.
From the Peter J. Merani Collection. Ex Howard D. Gibbs Estate (Part III, Hans Schulman, 26 January 1971), lot 93 (part of).
This countermark, one of the most common imperial countermarks, is likely a validating countermark used during the reign of Nero. For further discussion, see Kraay, "The Behavior of Early Imperial Countermarks" in Essays Mattingly, pp. 132ff.