This is a Fukuro obi
with appealing Matsu (pine tree) and 'ume' (plum blossom) in checkered Hishi (diamond shape) pattern, which is woven.
Sparkling foil threads used in the pattern makes this obi suitable for a formal usage.
Textile is soft silk.
Actual color is not bluish as shown on photos.
Uneven spots of weaving may be noticed when tied, and there are more then described on the drawing image. (described as stains/second photo below the drawing image)
It is discolored throughout, but not disturbing for wearing.
It has some other flaws as shown on photos.
Please see photos for details.
Although it has some flaws as mentioned, it still is a very charming item to wear!