| Manchuria Optical Industry co. was founded in 1938 by Nippon Kogaku under strong request of Kanto-Gun (Gwandong army) to fill the growing need for optical munition in the war with China. They first started with repairing of gun sights then to a mass production of 13nen shiki binoculars and other gun sights. Manchuria Opt binos can be easily found in mainland Japanbecause many soldiers brought them back. |
 | Manshu Kogaku 13nen shiki binos. The most easily found of Manshu Kogaku optics. |
 | Type 99 light machine gun sight. |
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