This is a Magewappa (bentwood lunch box) from the famous Kurikyu in Akita. It's very well-made, and the rice stays delicious even when cold. I believe the purchase price was around 14,000 yen. Inside the lunch box, I washed and dried it properly after each use, but it has inevitably darkened over time. Also, there is a small scratch on the lid. Please check the images and consider purchasing. Thank you.