Watch List notes:

Thrace, Byzantion, Alliance with Kalchedon, 3rd Century BC
AE26, 9.26 grams
Obverse: Veiled head of Demeter right.
Reverse: Poseidon seated right holding aphlaston and trident.
Schonert-Geiss 1257-62 // SNG BM Black Sea 82 var.

View a video of this coin here:
https://youtube.com/shorts/GN2j6gZmmF0

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Estimate: 200 USD"