Airspeed Indicator Fahrtmesser Fl 22231, 80 – 750 km/h Luftwaffe Sally Bomber This pneumatic gyro appears quite

This pneumatic gyro appears quite similar to those used in RAF aircraft produced by Sperry (especially the British label "Do Not Jar

Has a service label dated 1966

The gyroscope was key to successful instrument flight from the early 1900's

manufacturer unknown

According to the Maintenance Interchangeability gude dated Feb 1945

Airspeed Indicator Fahrtmesser Fl 22231, 80 – 750 km/h Luftwaffe Sally Bomber This pneumatic gyro appears quiteHere is an original WWII era Airspeed Indicator Fahrtmesser Fl 22231, indicating speeds from 80 750 km h, as used in aircraft of the German Luftwaffe, such as the fighters Messerschmitt Bf 109, Bf 110, and bombers Junkers Ju 87, Ju 88, and Dornier Do 217. This indicator shows Fl 22231 embossed on its dial, and Fl 22230 on its rear case. The dial is clearly of the Fl 22231, so it is possible that the rear housing was replaced using that from a Fl 22230