Today, I went to a Japanese traditional house in Osaka city. (There are less number of them in Osaka city than in Kyoto. Because almost all were burn out in the end of WW2.) Anyway, today’s client showed two helmets used by his mother and her family during WW2. Maybe for wearing it from bomb attacking. The right one in this photo was made of steel. But the left one was not. When I tapped on it, the sound of it was not obviously different from I thought. It was like sound from plastic toy helmet. After measuring this house, I googled about Japanese helmets in ww2. Then I got an information about it. Some kinds of helmets were made from plies of pressured papers….. It shows the lack of materials in japan around the end of WW2. For example, many bells were taken away to make weapons etc from many buddhism temples.