Hey guys could I please get your opinions on this as I am completely out of my field. I picked up what I think is a Japanese WW2 mess kit at the local recycling place this afternoon, I have been over it several times and the only marking I can find on it is a small stamp on the bottom which looks like two small rings with possibly a triangle inside, I have tried to get the best pictures I can but even with a magnifying glass and the naked eye I still can’t make it out properly. Also underneath the tray/insert is a roughly engraved Japanese flag with kanji inside.
Also would you happen to know what the insert that fits in the bottom is, I have just spent the last hour on google looking at Japanese mess tins and can’t find another one, it looks to have been with it a long time and is I think it might be an insert to stop rice sticking to the bottom of the tin? (my pasta cooker in the kitchen has a very similar thing)
Thanks for looking and I hope the pictures are good enough, if not I can take more tomorrow in natural light.

Luke.

Click to enlarge the picture