mgcoins database 
Thrace - Byzantion 357-340 BC AR tetrobol 2.5 g 1.27 cm 1.21 cm
obverse: cow stg l on dolphin BY
reverse: Incuse mill-sail pattern
Sear GCV 1582
Holleman Munten list 99 (1994) 8
B is in an archaic form that looks more like YΓmonogram
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