∅ 6.7 cm
全國購買組合聯合會 (Zenkoku Koubai Kumiai Lengoukai) was first established in 1923. It was Japan’s largest organization which coordinated the purchase of daily groceries and agricultural products during pre-war periods. It was reorganized to become a part of the Government in 1947.
On the bottom of the box it says “保証責任 全國購買組合聯合會 (Guaranteed by Zenkoku Koubai Kumiai Lengoukai)” .