This is a vintage Nagoya obi
with lovely Tachibana'(Japanese citrus) in mallet motif, which are thickly embroidered colorfully against black 'Shusu'(satin) fabric.
Textile is soft 'Shusu'(satin) silk.
Maegara is only on one side.
When you start wrapping the obi from your left tummy to right(Rotate obi clockwise), Maegara will show.
It has noticeable discoloration (A) due to its old age, and there are fine patinas and smudges.
Please see photos for details.
Because of its old age, it has some flaws, but it is still a very lovely vintage item.