Tachometer, Mechanical, British RAF Mk IXG Ref 6A/1191 in Original Box F-11 50 Caliber Browning M2 Aircraft

50 Caliber Browning M2 Aircraft Machine Gun

The photos show both the external and internal workings of the gun sight: an exquisite electro-mechanical computer developed well before the era of microchips

The tripmeter reset knob is bent just a bit

part number 10-30910-1

Measures 9

Tachometer, Mechanical, British RAF Mk IXG Ref 6A/1191 in Original Box F-11 50 Caliber Browning M2 AircraftThis is an authentic WWII era mechanical Tachometer Mk IXG Reference 6A 1191 used in single engine aircraft of the British Royal Air Force such as the infamous Spitfire and Hurricane fighters. These mechanical tachometers, aka engine revolution or speed counters by the British, were mounted on the instrument panel and connected to the engine by a flexible cable shaft. This one has a serial number showing a year of manufacture of 1944. This specimen is