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The thin parts bend like plastic but the spine of it is solid.

The first pic. Made me think comb but now I see it’s quite small?? Interesting 🤔

might be an old comb made from jet. Jet often feels plasticky, though I don’t know if that is how it would weather. You cold test it with a hot pin, jet will smell like coal and might smoke. The pin will not go in easily. If you have a streak plate (unglazed tile) it will streak brown. If it smells rubbery or sulfury, and/or the streak is powdery brown it is likely vulcanite. Horn is also a possibility, smells like hair when you pin test, and might streak gray. Of course if it’s plastic-plastic you will know right away.