As - Tiberius PONTIF MAXIM TRIBVN POTEST XVII S C

Tribunician Power XVII places this as squarely in 15–16 AD, the second year of Tiberius's reign following Augustus's death in 14 AD. The Senate's conferral of tribunician power on Tiberius had been a gradual, deliberate process engineered by Augustus over decades — by the time Tiberius actually ruled, the constitutional machinery was already his. The S.C. mark reflects senatorial authority over the bronze coinage, a division of monetary responsibility between Senate and emperor that Augustus had formalized and Tiberius inherited without modification.