Betsu-atsurae Yume Juransui-chi Saku Calligraphy Brush, Wood Box, Unused

This is a calligraphy brush.
It comes in a wooden box and the brush is unopened and unused. There is calligraphy and a red seal on the inside and outside of the box. The brush shaft is engraved with Betsu-atsurae Ken-go Yume Junsui-chi Saku.
An accompanying Japanese paper (like a certificate) is included.
As this has been stored by an amateur, I cannot determine the details of the brush (hair type, size, etc.). Please check the images before purchasing.
Please refrain from purchasing if you are sensitive or seeking perfection.
[Notes]
- Returns and refunds are not accepted.
- Stored by an amateur.
- I have no knowledge of brushes, so I cannot answer detailed questions.

Additional photos can be sent upon request in the comment section.