Turn and Slip Indicator, Mk IA, RAF 1937 PBM-5 Mariner The closest example in appearance

The closest example in appearance was used in the 1960's US Navy jet fighter Grumman F-11 Tiger

The indicator provides directional and course information to the pilot as transmitted from the gyros mounted elsewhere within the aircraft

It is in decent condition given its age

in a downward direction from the transmitter antenna

Turn and Slip Indicator, Mk IA, RAF 1937 PBM-5 Mariner The closest example in appearanceHere is an exceptional specimen of a Turn and Slip Indicator, Mark IA, invented by George Reid (according to the 'all knowing' Wikipedia) and made by Reid & Sigrist, as used on the blind flying panel of aircraft of the British Royal Air Force and the Royal Australian Air Force of WWII. It is an early version as evidenced by the all white markings; later versions had both white and green markings on the face. While the Mark IA was used across numerous