Antoninus Pius (138-161) with Marcus Aurelius (Caesar. 138-161) AR Denarius (Silver, 18mm, 3.19 g), Rome, 140-144
Obv: ANTONINVS AVG PI VS P P TR P COS III - laureate head of Antoninus Pius right
Rev: AVRELIVS CAESAR AVG PII F COS - bare head of Marcus Aurelius right.
References: RIC II 417a