Vintage Silver Tone Ottoman Turkish Necklace

vintage statement silver toned, Ottoman Turkish maybe pewter necklace, with genuine coin charm by hook adjustable closure orchid flower, lightweight needs to be reconnected, as shown in one picture. It's attached for now, but it's visible adjustable hook closure at 18" I dont know if that's onyx or semi gorgeous and unique, I see others selling for 150$ but theres the tiny flaw that needs a quick fix!