A pdf of the museum I found on the internet in addition gives: Gilt silver D: 76 cm.
Byzantine Period, 6th century A.D.
Korydalla (Kumluca) - A.1021
Large flat round tray with a ring base. Decorated with a gilded cross in the centre encircled by two gilded bands bordering a short engraved inscription reading: "To the glittering Virgin Mary". The flattened rim is decorated with concentric incised gilded lines. Beaten from a circular sheet of silver.