Видится крупная монетка, милиметров 28?
Поменьше, но тяжёлая. Вот описание:
DECAPOLIS, Petra. Hadrian. AD 117-138. Æ (26.5mm, 15.20 g, 7h). Laureate and cuirassed bust right, gorgoneion on breastplate, seen from the front / Tyche, turreted and veiled, seated left on rocky outcropping, extending hand and holding trophy. Spijkerman 2; RPC III 4099; Rosenberger 1; Sofaer 3. Earthen red-brown patina, small obverse flan flaw at edge. VF.