Watch List notes:

GREEK. Central & Southern Greece. AV Repoussé Plaquette Insert. Circa 6th century BC (perhaps earlier). Facing cephalopod / Incuse of obverse. Cf.https://www.ancient-greece.org/images/museums/athens-mycenaean/pages/athens-mus-mycenaean034.html (for Mycenean repoussé examples). As made.

This design is evocative of the Aegean and reminiscent of earlier Late Helladic types. Possibly used either as a necklace or ring insert.