New, Unused Showa Retro / Rare (this shape is unavailable) Aluminum Square Bento Box Manufacturer: Teinen Kogyo Size: For children Outer dimensions: 125 x 105 x 35mm Showa retro anodized (aluminum) square bento box, for children or those with small appetites. Teinen Kogyo was a dedicated bento box manufacturer. As a top manufacturer, it flourished about 50 years ago. Due to the changes of the times, now... This bento box is simple and orthodox.