Fuel Mixture (Fuel-Air Ratio) Indicator, Dual Engine Type B-6A Luftwaffe The knob at the top

The knob at the top right allowed the navigator to adjust for the desired course relative to the signal received from the radio compass

and the bomb bay droppable tank

It is in exceptional cosmetic condition for its age

has a different serial number so is not the original for this watch

Fuel Mixture (Fuel-Air Ratio) Indicator, Dual Engine Type B-6A Luftwaffe The knob at the topThis is an early WWII era Fuel Mixture (Fuel Air Ratio) Indicator used in early twin engine aircraft of the US Army Air Corps. Examples of aircraft which used this indicator are versions of the C 47 Skytrain transport, C 45 Expeditor, and A 29 Hudson bomber. See illustration of the location of the indicator on the panel of the C 45 from its flight manual dated 1944. Per the attached spec sheet, the instrument was a component of the fuel mixture