Nero Claudius Drusus (died 9 BC). Dupondius 22.49 g. Rome, struck by Claudius, ca. AD 41–42. 

NERO CLAVDIVS DRVSVS GERMANICVS IMP, bare head of Nero Claudius Drusus left, countermark NCAPR in incuse rectangle behind.
TI CLAVDIVS CAESAR AVG PM TR P IMP P P, Claudius or Drusus seated left on curule chair, holding branch, surrounded by arms, SC in exergue. 

RIC 109; BMCRE 210 = same as RIC 109/BMC 208-209 but with countermark); Sear 1896.

Counterstamp has been interpreted as Nummus Caesare Augusto PRobatus (Flavian date), or Nero Caesar Augustus PRobavit or Neronis Caesaris Augusti Populique Romani. 

Sold by Noble Numismatics Pty Ltd auction 121, Lot 4751, July 2019.