Airspeed Indicator, 300 MPH Kollsman 157-09-6223 F-105 Thunderchief and medium bombers and transport

and medium bombers and transport aircraft

but barely discernible in the photos

See photo of the location of the instrument on the air conditioning control panel from the C-121 flight manual dated 1965

Doing so rotates the circular inset card displaying the BHP

Airspeed Indicator, 300 MPH Kollsman 157-09-6223 F-105 Thunderchief and medium bombers and transportHere is an early WWII era Airspeed Indicator, Kollsman part number 157 09 6223 with a maximum airspeed of 300 MPH. It is, or very similar to, the airspeed indicator used in the Beechcraft C 43 Staggerwing of the US Army Air Force, see photo from its flight manual dated 1944 showing the indicator. It is in terrific condition given its age. Measures 3. 25 inches diameter by ~2. 5 inches deep.