Byzantium, Thrace. AR hemidrachm. 11 mm, 1.84 g. 387-340 BC. 

YP Y above forepart of bull left on dolphin, RA monogram (R retrograde) below.
Ornamented trident head. 

Schönert-Geiss 773; Istanbul 317

With permission of TimeLine Auctions 
(www.timelineauctions.com), July. 2022