Gyro Horizon Indicator, British RAF Sperry Mark 1B Japanese or Mach Speed Indicator

or Mach Speed Indicator

75in diameter and ~10in deep

See photo of the location of the instrument on the co-pilot's side of the instrument panel from the Flight Manual dated 1946

The MC-125 Tuning Unit is a component of the WWII-era airborne communication system Receiving and Transmitting Command Set SCR-AJ(and AL)-183

as depicted in its Flight Manual (unfortunately the page showing the indicator does not photograph well)

Gyro Horizon Indicator, British RAF Sperry Mark 1B Japanese or Mach Speed IndicatorHere is a British vacuum driven Gyro Horizon Indicator Sperry Mark 1B as used by aircraft of the Royal Air Force and British Fleet Air Arm during the 1940's and 1950's. This one has a manufacturing serial # incorporating "52", likely made in 1952. Measures 4. 5 inches diameter by 6. 5 inches long. The instrument looks terrific and would make a wonderful display piece, as long as you "Handle Like Eggs"!