PAPHLAGONIA. Sinope. Drachm (Circa 330-300 BC). Der-, magistrate.
Obv: Head of nymph left, with hair in sakkos; aphlaston to left.
Rev: ΔEP / ΣINΩ.
Sea-eagle standing left, with wings spread, on dolphin left. 5,31 g - 19,62 mm
Certificate of authenticity and provenance included . 
This drachm coin was minted in Sinope, an ancient Greek city located in the region of Paphlagonia, circa 330-300 BC. On the obverse side of the coin, you can see the head of a nymph facing left, wearing a sakkos (a type of headgear), with an aphlaston (a ship's stern) to the left. The reverse side features a sea-eagle standing left with wings spread, perched on a dolphin, and the Greek letters ΔEP / ΣINΩ.
The magistrate mentioned on the coin is Der-. Unfortunately, historical records do not provide detailed information about this specific magistrate. In terms of rulers during the period when this coin was minted, the region of Sinope was under the control of the Persian Empire. It was later a part of the Hellenistic Seleucid Empire before becoming part of the Roman Republic.