Imperial Japanese Army original military Hat and Aircraft crew notebook WW2 IJA

  
This is a military Hat and. From the former Japanese Army. It is from the war time. Aircraft crew notebooks do not have spines. I confirmed that there was a record of a practice flight in July 1933 inside. The cap is old and has dirt and scratches.

However, it comes with an insignia that I have never seen before. Someone who knows please tell me. Also There is a personal name written on the back, but it has been erased from the perspective of protecting personal information. How about a military collector?

International Buyers - Please Note.