Sinope, AR Didrachm, 8.16 gr, after 250 BC. 

SINOPEWN, Turreted head of Nymph Sinope left; countermark: 
radiate head of Helios facing.
SINO B, Poseidon seated left on throne, holding dolphin and 
trident; countermark: laureate head of horned Poseidon left. 

Ex Lockett Auc. 2149 = SNG v. Aulock 6859.

With permission of Tkalec AG, www.coinstkalec.ch.
Sold for 2,000 Swiss Francs.