This is a Fukuro obi
with 'Matsu'(pine tree) and flying crane pattern, which is woven on the purple and black background.
Textile is exquisite silk and has soft touch.
Besides folding lines, it has whitish smudges around the upper Otaiko(square bow) (It seems to be the place just tied.).
For the details, please refer to the photos and the sheet.
Though it has a bit of sense of use, if you don't mind those minor flaws, it is still in very good condition to wear.
This obi would be wonderful for a formal usage.