Go on... guess.
A shaving brush!
Genuine Horn, fan shaped DO1, Shavemac knot Kimson handle!
No joke, the Shavemacs are close to $200 for a 23mm. The stats for the Shavemac brushes are 23 by 53. It seems to be a match on that front. Plissons are even more loot.
I could tell by the overhead shot it had not seen much action. That is one big bloom. My "used" Chubby 3 did the same thing. I am happy to report it was still bleeding badger hair grease the first 3 uses. How did you like the big surface? The Chubby took some getting used to but it covers my whole face in one pass and my whole neck in one. I bet you found something similar.
Can you point me to the Rooney copies if you still have the link handy?
Those pics tell me it's a large Rooney knot custom handle.My T-H branded Rooney has the exact same measurements.The shape of the loft and density in the pics say it's a rooney as well.