undetermined countermarked Roman coin of Trajan

?, Trajan, 98-117 AD.,
Æ 22 (21-22 mm / 5,08 g), bronze, axes medal alignment ↑↑ (ca. 0°), corroded,
Obv.: …AIAN... , laureate bust of Trajan r., oval countermark behind: bearded head (Herakles?) r.
Rev.: ... , figure seated left (?).
for countermark: cf. Howgego (GIC) 13-17 .