It's common to the Greek coinage of Kyzikos; it attests to the importance of the fish in the city's economy. You can see multiple examples if you follow the "Kyzikos" tag on Archaic Wonder, on the same coins that feature Pegasos, the Chimera, Pan, Perseus, Kerberos, the city's namesake hero, a crouching sphinx, other myths with which fish are not intuitively connected.
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It's common to the Greek coinage of Kyzikos; it attests to the importance of the fish in the city's economy. You can see multiple examples if you follow the "Kyzikos" tag on Archaic Wonder, on the same coins that feature Pegasos, the Chimera, Pan, Perseus, Kerberos, the city's namesake hero, a crouching sphinx, other myths with which fish are not intuitively connected.