Ca peut être ce qu'il reste d'un as de Claude au revers CONSTANTIAE AVGVSTI, genre ça (sans garantie du gouvernement vu l'etat):
Claudius, As produced at a "branch mint", AD 41-42
TI CLAVDIVS CAESAR AVG P M TR P IMP, Bare head of Claudius left
CONSTANTIAE AVGVSTI, Constantia helmeted standing left holding spear, SC in field
10,84 gr
Ref : RCV #1857, Cohen #14
For better understanding of where this might have been minted, see : http://www.forumancientcoins.com/board/index.php?topic=65318.0