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

Description

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