Asta Bidspirit | A greek hellenistic sardonyx pierced

A greek hellenistic sardonyx pierced intaglio. Frontal helmet. 3rd - 2nd century B.C. 15 x 19 x 8 mm Frontal helmet with crest. Trough hole. Wear marks. Beautiful three layers sardonyx. Parallel: greek coinage cfr. Thrace. Mesembria. Diobol. s. IV BC. (SNG BM Black Sea-268/271). (Topalov, Messambria-8). (Karyatov I-37/38). Anv.: Frontal helmet. Rev.: wheel with META within the spokes and radiant lines on the edge. Provenance: UK private collection.