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It's all up to you, of course, and how much it bothers you. Boar does tend to get pretty big as it gets broken in, so it's nothing unusual. I would avoid clipping personally, but that's just me.

I would bet a pretty penny on it. The light parts look a bit too blonde for badger, in my opinion, and the hairs seem pretty thick. And the way the knot looks a little crazy from above? Looks like...

My friend, that is one quality Boar brush. nice find!