Antoninus Pius, 138-161. AE Sestertius 32 mm, 24.32 g. Rome, struck AD 153-154. 

ANTONINVS AVG PIVS P P TR P XVII, laureate and draped bust right.
LIBERTAS COS IIII, Libertas standing front, looking right, holding pileus in her right hand and extending her left. S-C across fields.

RIC 916b; Cohen 536; Strack 1093. 

Sold by Gorny & Mosch auction 200, Lot 2577, Oct. 2011.