Thanks don`t really understand what do you me by abbreviation, could you please give example, could it be the pilots unit designation, sometimes found on tails of planes. ???The top one isn't a kanji. It is hiragana and is read "sa". It is an abbreviation for something.
The name on the helmet is probably written front-to-back.
here is a photos of inner ear cover, I think the showa date (if I'm reading it right) is 17 so it was made in 1942. could you please check and confirm, also is there a makers name and any other information would be very much appreciated.Could it mean something like " Special Operation "
Hi and thank you all so much for all your help, I guess we will never know what the " hiragana " and is read "sa". was meant to mean.Yes, the date is Showa 17, i.e., 1942.
The kanji next to the date would be 広支. This is also an abbreviation for something.
The one in the circle is a surname 杉田 Sugita.
The vertical line is 香川納. 香川 Kagawa can be both a surname and place name (prefecture or city).