Description: Round gem. Green glass. Abraded.
A: Frog, seen from above
B: Greek inscription in two lines: φυλα|ξαι → φύλαξαι (for φύλασσε or φύλαξον): 'Protect me!'
Bibliography
Bonner, SMA on CBd-1523
Mastrocinque 2014, no. 553.
The Cabinet des Médailles database on CBd-1523