These old Vulfix knots were hand sorted, there are little to no thick bristles. They were made by hand & I think this took too much time as they were discontinued when Mr Watterson Senior retired. The bristles now are super soft but still need soaking as they are quite fragile. Luckily I have a few London series boars as this Hyde Park looses a few hairs each shave.
I do have some Vulfix knots left & keep meaning to pair them with these handles:
Turned by the late Bill Jack, & so long a go I can't remember what two of the woods are. The middle handle is Laurel wood (Prunus Rotundifolia) from my old garden. I think they may be Rosewood (left) & some sort of Birch.