Reversible narrow kaku obi - gray with flames pattern

Kaku obi are narrow and long obi sashes, usually worn by men.
This one is reversible, in two shades of darker gray. One side is darker, with an asymmetrical, flame-like pattern; the other side is lighter, with a single strip with stylized kanji pattern.
Please note, this is a vintage item. It looks unused, but some pulled threads, some creasing, or other minuscule imperfections, might be present. Please check the photos for the details. . Thank you for your understanding.
Original colors might slightly vary from these displayed on screen.

Length ca 395cmcm, width 10.5cm.