Turn and Slip Indicator, Mk IA, RAF 1937 PBM-5 Mariner but it is an exceptional

but it is an exceptional artifact from WWII

"This unit is equipped with a vacuum-driven gyroscope with its operating range limited to 55 degrees climb

in a downward direction from the transmitter antenna

has a rotating disk with Pioneer and numbers on it for us as a course reminder

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

Turn and Slip Indicator, Mk IA, RAF 1937 PBM-5 Mariner but it is an exceptionalHere 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