Hi Kirsty, I'm not an expert but if I had to hazard a guess I would say that it could be an operculum (gill cover) from a fish. However, I'd wait for a response from someone who knows more than I do!
thank you, i do hope i get another comment my husband did say something like gill cover or cheek of a fish
It is indeed an operculum - we once had a lady who found quite a large one in her garden that was probably the remains of one of her neighbours Coy Carp (I guess most fish can be attributed with coyness)
thank you very much.... i needed an actual answer an thank you