Looking for info. I recently found out that an old watch my grandfather had brought back from WW II is a seikosha Kamikaze watch. I had no idea what it was so I brought it to my friend who is a watch maker/ repairman for breitling. He cleaned. It, opened it up and says the 17 j movement is in perfect condition. It runs like a top. Everything is original except for the besel which was broken when I found it. He replaced the besel with a thick plastic one that is similar to the original one. It has Japanese writing on the back. Just trying to figure out what I have here.