Hi Visor-san,
The emergency food ration {防衛食(Boueishoku) - Protection Food} were emerged during late war in Japan (around 1943). They have to use ceramics to replace precious metals. There should be some other markings (outside)under the container. I think you example should have a circle with the character 防 with a 2 underneath. To open when sealed, make a hole in the center of the cover. There are also many different kinds of contents, based on the numbers.
So far I've seen 13,15, and 2.
Regards,
Taka
Last edited by SHINDENKAI; 06-27-2014 at 03:58 AM.
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