This is a vintage Maru obi
with dynamic wave, 'kiku'(chrysanthemum) and Matsu (pine tree) pattern, which is woven.
Gold foil threads included in fabric and the pattern twinkle gently.
Textile is jinken 'rayon' it feel rather stiff.
Length is 400cm(13'2"), rather short for Maru Obi.
It has patinas due to its old age, but they are too fine and not disturbing.
Corners of Tare and Tesaki ends are frayed.
It has folding lines.
Please see photos for details.
Because of its old age, it has some flaws, but it is still a very lovely vintage item.