Turn and Slip Indicator, Mk IA, 6A/675, RAF 1939 Core Viscount The dial has some slight

The dial has some slight water marks

part number 644730

the remote control gun turret system

It has a serial number prefix of AC-39

A flash tube

Turn and Slip Indicator, Mk IA, 6A/675, RAF 1939 Core Viscount The dial has some slightHere is a Turn and Slip Indicator, Mark IA, Type 6A 675, 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 British