Nice brush! I've been using my Simpson AS2M and trying to find the niche that works for this brush. The knot is in great shape and I'm reluctant to replace it since it looks so nice.
I think this is a bowl lathering cream brush. Find out what works for you and my advice is to keep the original knot unless it is totally shot. Of course, it is your dream brush so if you want to put a black knot in it, why not?
Hydro-magic Injector, assorted straights
Commodore X3 2-band, Vintage AS2M, Thater 4125/1, 2010 B&B Custom Boar, #33 B&B Limited Edition RV, Wee Scott
Pilot Vanishing Point, Waterman Expert II, Esterbrook J in Blue and Orange, Sheaffer's Admiral Snorkel, TWSBI ROC 100