Vintage GREEK ISTROS COIN 14K Gold Sterling Silver Ring Men's 400-350BC 469C

Size: a "hair" under 7 3/4

Weight: 15.0 grams, hallmarked "925".

Coin has not been authenticated (yet), however most of these rings I see have authentic coins.  There is no guarantee it is authentic (for now).  Any additional advice would be appreciated.

Coin data: 

Features: The Dioscuri

Region: Thrace

Mint: Istros

Materials: Silver Coin

Framing: Silver, 14k

Reverse: Eagle on dolphin

Denomination: Stater

Date (if coin is authentic) : 400 – 350 BC

Condition: Coin has been resized (photos 11-12), scratches and nicks from use, coin moves very slightly, very good condition.

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469C