Claudius and Nero Caesar, AV aureus. AD 50-54, Rome. 7.61 g. 

TI CLAVD CAESAR AVG GERM P M TRIB POT P P, laureate head of Claudius right. 
NERO CLAVD CAES DRVSVS GERM PRINC IVVENT, bare-headed, draped bust of Nero left. 

RIC 82; Cohen 4; BMC 79; Paris 85; Calicó 391.
Very rare. 

With permission of Numismatica Ars Classica auction 101, Lot 125, Oct 2017