Tenos, Cyclades, AR didrachm. ca 200 BC. 6.54 g.

Diademed head head of Apollo Karneios right, with ram's horn.
THNIWN, Poseidon, nude to waist, standing left, holding 
trident and dolphin, bunch of grapes in left field. 

SNG Lockett 2631; McClean 7300.
Very rare. 
Ex Leu Numismatik AG, 65, lot 182, (1996)

With permission of Hess-Divo AG, Nov 2015