Japanese helment markings.

I took the helmet off of my Type 99 light stand and I noticed some factory markings on the inside. Is there a web site that lists markings like has been done for German helmets?

Maybe it isn't Japanese as one marking has a S inside of a diamond and believe it or not, Japanese mark that looks like British broad arrow!!


https://www.milsurps.com/images/impo...MG_14771-1.jpg

Is this one of the markings? If so it is a size mark on Japanese Army Helmets, Ray

Thanks, but I do not think so. What ever they are, they are stamped into the metal of the helmet rim on the inside. I will try to take a picture of them in the sun tomorrow.

The markings


https://www.milsurps.com/images/impo...IMG_1622-1.jpg

https://www.milsurps.com/images/impo...IMG_1621-1.jpg