This is a Tsumugi Fukuro obi
with enchanting classical designs of phoenix, deer, and Matsu (pine tree), which is woven with sukui technique, a kind of tsuzure weaving technique.
Textile is Tsumugi
silk, and it has soft to the touch.
There is a black stain, 4cm(1.56in), near deer of Otaiko pattern pattern, which may show when tied. (sorry no photos)
It does not have any folding lines, and it seems unworn.
It also has streaky stains on the wrong side, described as dyestuff stains.
Please see photos for details.
Although it has some flaws as mentioned, it is still in wearable condition.