As Antoninus Pius - Genius
ANTONINUS PIUS. Æ As. Rome, 160-161 AD.
Obv. ANTONINVS AVG PIVS P P Laureated head r.
Rv. TR POT XXIIII COS IIII SC Genius standing right, holding patera and scepter, sacrificing over burning altar.
RIC 1052; Cohen 1052 (2 F)
References in Cohen and consequently RIC don't reflect the scarcity of this type (one worn in wildwinds, none in coinarchives but see Curtis' answer below), struck in the short final tribunician year of Antoninus' reign, between December 10 160 and his death on March 7 161.
Type possibly featuring the genius of the emperor ([i]genio augusti[/i]) or the genius of the Roman people ([i]genio populi romani[/i]), though without the usual cornucopia as attribute.
In Roman mythology, every man had a genius and every woman a juno (Juno was also the name of the queen of the gods).
Originally, the genii and junones were ancestors ho guarded over their descendants. Over time, they turned into personal guardian spirits, granting intellectual prowess. Sacrifices were made to one's genius or juno on one's birthday.
In addition to the genius or juno of each individual, regions, families, households and cities had a genius. [wikipedia]
Brown surfaces with remains of a thin soft (wax-like) layer.
Ex. Wallyn (MA-shops), 22 Dec. 2008