Wish I could answer you David. It looks modern (and thus I passed on it) with carabao bone, not horn. Some of the piercing work seems to me to be done much later, although this chasing work is good. Also I usually see bone scabbards like this on newer ones.
As far as the metals are concerned, it looks like copper and either nickel-silver or silver plated copper (also very common). Of course the only way to know for sure is to test the metal........
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