As - Antoninus Pius (TR POT COS III S C; Mars)
Obverse
Head of Antoninus Pius, laureate, left.
Lettering: ANTONINVS AVG PIVS P P
Reverse
Mars, helmeted, naked but for cloak on right arm, holding spear in right hand and round shield in left, descending right through air to Rhea Silvia, who is asleep, reclining left, on the ground, right.
Lettering: TR POT COS III S C
Technical Details
Obverse Lettering
ANTONINVS AVG PIVS P P
Reverse Lettering
TR POT COS III S C
Comments
Example of this type:
American Numismatic Society (ANS)
Source:
Online Coins of the Roman Empire (OCRE)