This is the typical "Kamikaze" Pilots watch. They were the Seikosha Type 93 and Type 100 instrument clocks.
They were worn around the neck with a white raw silk cord.
Sometimes, there are images of Kamikaze pilots with a what appears to be a silvery round cased black dial watch also worn with silk cord.
Prior to the Kamikaze, you can see Japanese pilots wore wristwatches.
Tensoku is probably the most famous Seikosha of WW2.
Yukio Seki wore one.
I think it is pretty obvious that Japan has a longer history of fighter pilot aviation prior to Pearl Harbor.
Kamikaze was the last phases of the war.
The ceremony before the mission flight was based in the Shinto religion.
Sake (rice wine) is often used in Shinto religion from everything from
birth, marriage, New Years purification, and death. This tradition is centuries old.
Japanese when preparing for "ikusa", which is battle from Feudal Japan era, would
wear a "hatchimaki", which is the headband. In high school for the "jukenn sensou"
college application war, students in my generation wore hatchimaki also but obviously
without the words Samurai or Kamikaze written on them like tourists headbands.
If you ever wondered why a pilot needs a pistol when he can't possibly use it against another pilot...it's to shoot himself in a burning plane.
The "ken" or samurai sword, is the last item that identifies the samurai soldier.
Samurai would never part with his sword all the way through the Meiji era and was
often a big issue prior to the world wars. During WW2, the samurai sword was a symbol
of the kamikaze pilot and his duty to protect his country and people. It sometimes is different from the officers swords that could look more European.
So getting back onto the main topic. This watch is the one with a secret.
This is what it looks like today and in 2017.
Until curiosity got to me from an article written by Andrew Tolley, I was not aware that it had kanji issue number traces on the inside of the watch. I am not sure what is the first number, it could be a 9 or 6. The next two numbers are definitely a 4 and 6. The other important identification is the Longines order number 20853 was one of the orders for the Imperial Japanese Navy Weems.