WW2 JAPANESE ZERO COCKPIT CLOCK SEIKOSHA.
The Japanese aircraft cockpit clock by Seikosha was fitted to all WW2 Japanese aircraft and was commonly known as the Zero Clock. They are not as common as cockpit clocks from other countries.
This example is in working condition. The dial is not as bright as the images portray due to the camera flash. This is due to fading from age however it is still easily readable.