Odessos, Thrace AE21, Autonomous issue. 

Obverse: Laureate head of Zeus right.
Reverse: ODHSITWN beneath Serapis on horseback, riding right, 
LY monogram below.

Moushmov 1528; Sear Greece 1679. 
This monogram possibly unpublished (not in BMC, Moushmov, Grose, Imhoof etc.)

With permission of TimeLine Originals (www.time-lines.co.uk), March, 2012