^^^^^ that's a Beauty, Nice Root-beer Color
I recall a thread about getting the funk out. I think It involved a soak in a Dawn soap, and borax solution, followed by an overnight with regular shaving soap left on the brush. A quick search did not find it, but I used it a year or so ago and it worked great.
I have never had a Simpson or Kent knot that smelled bad, but my TGN knots were awful in the beginning. One treatment cleaned them up well.
The VDH was useable today and surprisingly it held more than three passes of lather.
Here is the first brush that I want to re-knot