Gyro Horizon Indicator, Japanese Army Aircraft, Type 98 or 100 ME-109 and likely many others

and likely many others

or patrol observer

from 0-4500

The clock is wound by turning this red knob counterclockwise from its home position

From our friend Laurent at Aircraft-Gunsights

Gyro Horizon Indicator, Japanese Army Aircraft, Type 98 or 100 ME-109 and likely many othersThis is a WWII era Gyro Horizon Indicator as used in aircraft of the Japanese Army. It appears to be either a Type 98 or 100. According to the website Funatsu Aviation Instrument Museum the Type 100 was used in the Type 1 Trainer, the Type 2 and Type 4 Fighters, the Type 4 Bomber, and the Ki 106. Our Google Translate app interpreted the date on the label as Showa 11, which is 1936. The knob at the lower left adjusts the flow of air through the