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Can you please tell me what do I need to look for when examing the stone to determine if it's a coticule or not?

These are the only pics I have so far and they're from the seller's page...I will take a better photos when I'll have it in my hands.

I've picked this hone from a seller that have no clue to the hone origins or type. Can you please try and identify it?
Thank you!

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