Watch List notes:

Antoninus Pius augustus, 138 – 161. Sestertius 145-161, Æ 27.14 g. Laureate and draped bust r. Rev. Securitas seated l., holding in r. hand sceptre and resting head on l. C 757 var. (without drapery). RIC 782.
Lovely green patina somewhat smoothed, otherwise extremely fine