Fuel Flow Indicator, Dual, Engines 1&2, Bendix, C-121 Lockheed Constellation
This is a dual Fuel Flow Indicator, for engines 1 & 2, as used in the US Air Force C-121 transport version of the Lockheed Constellation. See photo of the location of the instrument on the Flight Engineers instrument panel from the C-121 flight manual dated 1958. The data label shows manufacturing for an order by the BUAER, Bureau of Aeronautics, US Navy, so it was likely made for a Navy version of the C-121 (R7V-1) or another US Navy aircraft. It has a label of the Naval Air Station (NAS) San Diego (SD). There is a small dent underneath the case, see photo. Measures 3.25 inches diameter and 6 inches deep.