From the Showa era to the early Heisei era, a medicine vendor from Toyama used to deliver over-the-counter medicine to my parents' house once a year. The invoice in the fifth photo is dated "August 29, 1972." I wasn't even born yet (lol). My parents got married around 1965, so it might be a medicine box from that time. This year is Showa 100, so it's definitely something from over 50 years ago. The price of medicine was cheap back then... "Akachin" wound medicine – young people probably don't know it... The size is 21.5 cm x 24.5 cm. I'm going to sell them as a set of two since I have them. Besides its function as a medicine box, if you're interested in it as a retro Showa-era item, please consider it.