Brass Lab MoMo 31D French Horn Mouthpiece

This is a French horn mouthpiece from Brass Lab MoMo.
It is a deep mouthpiece with a cup inner diameter of 17.3mm and a throat diameter of 4.3mm.
It has been used for about a week, so there are some scuffs on the shank.
Although the inner diameter is slightly small, this mouthpiece allows for smooth playing from low to high notes.
It is an expensive mouthpiece with a suggested retail price of 57,200 yen, but I am selling it because I prefer a warmer tone.
I believe it would suit those who are looking for a brighter tone.