White obi for Buddhist robes

This appears to be a white obi for Buddhist vestments.
It is likely made of pure silk, but this cannot be confirmed.
The front side has a woven pattern, while the back side is plain weave.

Width: 9cm
Length: 4m

Upon unfolding, there are approximately 4 stains on the patterned side. Please refer to the 4 photos for details of these stains. The reverse side of these stains is also dirty. Please refer to the 2 photos for the stains on the back.
This is a subjective assessment by an amateur. Please refrain from purchasing if you are concerned about even the slightest imperfection.