The 1st photo
☆第 6397 號..............(Army marking) Serial Number 6397
昭和 17 年 4 月........... April, 1942
株式会社 絹田電機製作所... Kinuta Electric Manufacturing Co Ltd
I have no idea about the product of Kinuta Electric Manufacturing Co Ltd.
The 3rd photo
第 R10577 號..................... Serial Number R10577
昭和 17 年 10 月................. October, 1942
株式会社 横河電機製作所 N.538... Yokogawa Electric Manufacturing Co Ltd
I have no exact idea about the N.538 either.
The 2nd and 3rd compass pictures show the MK-1 compass for the army which was equipped for Type 91 fighter, Type 95 model 3 intermediate trainer, Type 97 model 1 bomber, Type 98 direct cooperative reconnaissance plane, Type 99 advanced trainer and Type 100 transport plane.