Fuel Quantity Indicator, AN-F-48,-58 Fuels, US Army Air Force, KB-29P Aerial Refueling Wellington It has a date-stamp on

It has a date-stamp on the side of the case indicating a date of manufacture of 1940

and ~1/2 inch thick

As the hand passes 10 seconds

Here is a fine specimen of a Fuel Quantity Indicator for the Reserve (Front) fuel tanks as used in versions of the infamous US Army Air Force twin-tailed fighter P-38 Lightning

radio operator

Fuel Quantity Indicator, AN-F-48,-58 Fuels, US Army Air Force, KB-29P Aerial Refueling Wellington It has a date-stamp onHere is a very interesting dual fuel, Fuel Quantity Indicator, made by Minneapolis Honeywell part number G700C33 for the US Army Air Force order with a BAC prefix (Boeing Aircraft Corporation) for a Boeing KB 29P Aerial Refueling Aircraft. The KB 29P (116 of them) were created starting in 1948 from modified B 29 bombers, which pioneered the way for future designs of aerial refueling aircraft. The indicator is specifically part of the refueling system,