Antoninus Pius (AD 138-161) AE sestertius, issued 144. Rome, 29.13g, 34.5mm.
Obv: ANTONINVS AVG PI-VS P P TR P COS III, laureate head right
Rev: SALVS AVG; Salus seated left, holding patera to feed serpent coiled around altar to left, S C in ex.
RIC 637 (only 7 on acsearch)
From the Severus Alexander collection

A handsome VF sestertius, with good detail on a large flan and a black patina with hints of green. Better than the photo.