Airspeed Indicator, 300 MPH Kollsman 157-09-6223 F-105 Thunderchief it serves no other function

it serves no other function and requires no other radar in the aircraft

Beam Approach Beacon System – BABS – was a homing device used to help pilots land in poor visibility

See illustration of the S-2E Tracker instrument panel from its Flight Manual showing the location of the indicator

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

Airspeed Indicator, 300 MPH Kollsman 157-09-6223 F-105 Thunderchief it serves no other functionHere 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.