Aircraft Clock, 8-day Civil Date Indicator Aeronaval (CDIA) Waltham WWII KC-135 The knob adjusts the accuracy

The knob adjusts the accuracy of the reading by calibrating the instrument to the current barometric pressure as shown in the small window above center

copyrighted in 1943

It is clearly experienced but in reasonable condition given its age

25 inches across and ~ 3

Aircraft Clock, 8-day Civil Date Indicator Aeronaval (CDIA) Waltham WWII KC-135 The knob adjusts the accuracyHere is a fine example of a WWII era CDIA Aircraft Clock, 8 day, 24 hour dial, made by Waltham. According to the Waltham website: Approximately 134. 000 CDIA aircraft clocks where produced and equipped with Walthams famous 37 size, 8 day movement, housed in a black aluminum case secured to the aircrafts instrument panel. The crystal glass was secured by a bezel and gaskets to seal the movement against dust. The bezel assembly enclosed the civil date