Bronze disc with a small handle. The disc is divided into four concentric zones, each in turn divided into sub-zones and containing characteres and Greek letters. R. Wünsch read:
ωιοαη|ιεαω|υηεω|ειοαω||ηουι|αεηιουω|ιηοε|ηωεοι → vocales including the Greek vowel series.
Wünsch 1905, no. 2, fig. 3, 8-9.
Further bibliography, description and images available in the 'Antike Bronzen in Berlin' database.