Oil Quantity Indicator, 4 Tank, EA-48-16, B-29 Superfortress

This is an authentic WWII-era quad-tank Oil Quantity Indicator made by Liquidometer, PN EA-48-16, as used in the US Army Air Force's Boeing B-29 Superfortress (see illustrations of B-29 Flight Engineer's instrument panel showing instrument location). 

Each of the four engines in a B-29 had an 80 gallon oil tank in the nacelle with a 5 gallon expansion space.  The knob situated below the display on the indicator rotates to the oil tank display 1 thru 4, indicating the quantity of oil in each from 0 to 85 gallons. 

The instrument is experienced but is in exceptional condition for its age.  The dial markings are clear and the glass and case are intact. Measures 3.25 inches wide by 5.75 inches high and 5.5 inches deep.