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This was found in some slumped red Crag at Walton on the Naze. It hasn't been subject to any beach erosion at least in modern times.
It is very black and highly polished, as such it is quite slippery and difficult to hold.
I did suspect it might be a part of a crustacean but it isn't hollow. Is is a tooth?
Message was edited by: Coracle; Added third scan
It is indeed a tooth section. It is highly worn/polished meaning is a derived fossil. It came from a ray called Myliobatis toliapicus.
Thanks Thomas for your quick response.