This is a Fukuro obi
with cheerful butterfly, Tachibana'(Japanese citrus) and kikyo 'bell flower' pattern, which is woven against gradation base.
Gold foil threads included in fabric and the pattern twinkle gently and makes this obi suitable for a formal usage.
Textile is soft silk.
Length is 410cm (13'5"in), rather short for Fukuro Obi.
It has folding lines and other flaws as shown on photos.
Please see photos for details.
It has slight musty smell.
Although it has some flaws as mentioned, it is still in wearable condition.