Yellow Reversible Half-Width Obi

This is a vibrant yamabuki (deep yellow/orange) color half-width obi.
The actual color is very close to the photos.
It is reversible, featuring a geometric pattern on one side and a wave pattern on the other.

There are a few areas where threads are loose, as shown in the second photo, but overall there are no visible stains and it is in beautiful condition.
(Please understand this is based on my personal observation.)

The material is unknown.
As it is an older item, I suspect it is pure silk.

Length: Approximately 380cm Width: Approximately 15.1cm