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Jd
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Barrow Museum
It is a slightly broken single chamber from the shell of an ammonite.  The chambers were linked to the ammonite creature itself, living in the widest part, and could be filled either with water or air according to the buoyancy requirements of the ammonite (like a submarine).  Modern Nautilus behaves much in the same way.
There's no way to be more specific about identity without more of the fossil being present.  You don't mention where it was found, which is generally useful in determining the geology/age of the strata involved.
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Jd
Yes sorry, it was found on the Isle of Wight , looked like a fresh beach cliff fall so the rest of what it was , was scattered and buried. Thanks for the feed back , I haven’t got the fossil as left it on the beach hence no ruler or size comparison next to it. 
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