An episode of Sophocles’s Oedipus Tyrannus (Rex). It shows Oedipus standing in front of the sphinx. Behind him is Sophocles’s famous saying in Greek letters (vertically).
Reverse lettering
‘OΣ TA KLEIN (sic)’
ΑΙΝΙΓΜΑΤ’ ΗΙΔΕΙ
KAI KPATIΣTOΣ ‘HN ANHP
C.M.S. (Translation: The caption should read, `Ος τα κλειν’ αινίγματ’ ήδει και κράτιστος ην ανήρ, which translates to, `He who knew the great/famous riddle(s) was a strong/powerful man.`)