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Well I'm not expert so I won't pass judgement but to me that seems like its Tshell or at least very convincing dyed horn. Though I've never seen horn dyed that well.

Search for the hot pin test. I believe real t shell smells like burning hair, plastic smells like, well plastic.

The only way to tell for sure is the hot pin test. I would say thats a good imitation but it looks kinda like a set of faux tortoise scales I handled the other day. Just heat a pin with a lighter and...