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A side note on denicare, it can feel a little gritty under your fingers, but the abrasive is very soft, so the larger grits just crumble up as soon as you start using it. It's actually VERY mild...

I'm pretty well out of my pipe collecting days, but I agree 100%. That looks just like an old vulcanite pipe stem.

IF it really is vulcanite, you cane actually get rid of the oxidation and shine...