Old large ancient silver(?) coin/medal? Help please?

I'd love any input on this heavily worn coin/medal. Any guesses? It feels like it could be silver, but am not sure.

 

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Is it really thin? I almost see an Ummayid denar there if you rotated it a quarter turn.If its not really thin, its not islamic silver, but could be islamic copper.

 

It is actually quite thick at 4mm. still think its Islamic copper?

 

Copper is thicker, but I honestly do not know sir.