Vintage Japanese Black Hanami Sakura Bento Jubako 3 Tier Lunch Box

Marked with a gold seal and the letters O M C Japan. 3 Tiers to this Bento box covered in Cherry Blossom design. Stands 6" tall assembled. Each box is 6.5" x 6.5" x 1.5" deep. I'm unsure of exactly how old this one is. Other items listed online with this brand are all Vintage. Hand washing is recommended to preserve the raised design.