The identification is as follows:
ROMAN EMPIRE - Gordian III (238-244 A.D.) AR Antoninianus.
Obverse: Bust of emperor facing right, radiate, draped, cuirassed; IMP GORDIANVS PIVS FEL AVG.
Reverse: Apollo seated left; bare to waist; holding branch and resting left elbow on lyre; PM TR P IIII COS II PP. Rome mint, A.D. 241-243.
Reference: RIC IV-3 88; Cohen 250; Sear (5) 8645.
Best regards.