As Antoninus Pius - SPQR OPTIMO PRINCIPI title
ANTONINUS PIUS. AE As. Rome, 147 AD
Obv. ANTONINVS AVG PIVS P P TR P COS IIII laureate bust right, draped and cuirassed, seen from 3/4 front
Rev. SPQR / OPTIMO / PRINCIPI / S C, legend in four lines within oak wreath.
RIC 827b; C. 793 (4F)
Some peculiar high relief medallion-like portraits with cuirassed bust for this type seem to show that there has been a special emission in addition to the regular type, celebrating the attribution of the SPQR optimo principi title to Antoninus.
A die-link of another cuirassed bust obv. to a PIETAS AVG reverse is to be mentioned.