Airspeed Indicator, 300 MPH Kollsman 157-09-6223
Here 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.