At one time ladies wore watches around their neck Too small to be pocket watch These watches are called what?

I have a Tiffany and Co. Watch it is small, open faced and sterling silver. I was looking to see what these fetch but I do not know what to call it. It is too small to be a pocket watch. I suspect they were work around the neck but it does not look like it were a pendant. Its just a miniature pocket watch. I suspect these had a name at one point in time. Does anyone know what these were called?

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