Forums SEASHELL-COLLECTOR

I bought this a while back and have no clue to what it is any help would be great it is about 90mm long thank you

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Hi,
This doesn't look much like a seashell from this perspective.  It looks more like a mineral specimen of some  kind, obviously polished.  Near the center is an area suggestive of a fossil, but I can't even be sure about that.  Could you provide a couple of additional views?