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It won't kill the tree, but the excess zinc levels on a galvanism nail will probably kill the cambium for a few mm around the nail - Then over time the tree will simply grow around the wound - It will probably not stunt it in any noticeable way - that said Id remove the batton asap - the Birch will be adding .25 to .5 a inch Diam a year if its young, and will press against it pushing the fence away.
bloody resilient things trees are