I just got my new Semogue 1305 Superior Boar Bristle Shaving Brush. It is the one on the left.
I like it. I prefer boar because I don’t want to kill badgers and because the bristles are stiff and it basically works better.
I got the old one decades ago, and it was decades old when I got it. I should note that I wasn’t actually using it (much) when there were so few bristles. That is what it looked like after I ran it through the dishwasher to see how clean it could get. I think a few bristles fell out.
Anyway, I shopped around, picked the Semogue 1305 Superior Boar Bristle Shaving Brush, and I like it, so now, if you are looking for one, you don’t have to do as much research. You’re welcome.