Watch List notes:

Antoninus Pius. A.D. 138-161. AR denarius (17.3 mm, 3.47 g, 6 h). Rome mint, struck A.D. 157-158. ANTONINVS AVG PIVS P P IMP II, laureate head right / TR POT XXI COS IIII, Annona standing right, left foot on prow, holding rudder, and holding modius on left knee. RIC 275; BMCRE 908; RSC 1039. VF. 

BMC refers to the figure on the reverse as Tranquillitas instead of Annona.