Watch List notes:

Nero and Drusus, Caesars. Died A.D. 31 and 33 respectively. AE dupondius (28.6 mm, 16.01 g, 7 h). Rome mint, struck under Gaius (Caligula), A.D. 39-40. Rare. NERO ET DRVSVS CAESARES, Nero and Drusus on horseback riding right / C. CAESAR. DIVI. AVG. PRON. AVG. P. M. TR. P. III. P. P, legend around SC. RIC 42 (Gaius); BMCRE p. 156, n. ‡. EF. 

Ex Ira & Larry Goldberg.