Vespasian AE Sestertius. Rome mint, 71 AD.  

Obv: IMP CAES VESPASIAN AVG P M TR P P P COS III, laureate head right 
Rev: SALVS AVGVSTI, SC (upside-down) in ex,  Salus seated left, holding patera   & scepter.

RIC [2008] page 73 notes for this type that "one die (e.g. Stockholm; Clay) 
the SC is inscribed upside down."

[Imported from dirtyoldcoins.com, March, 2008]