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Aircraft Clock, Jaeger LeCoultre A-10 Chronoflite Elapsed Time Chronograph, US Navy

Jaeger

Aircraft Clock, Jaeger LeCoultre A-10 Chronoflite Elapsed Time Chronograph, US Navy

Not for Sale

This artifact resides in our Private Collection, yet we welcome inquiries from restorers, museums, or serious enthusiasts. Please email us with the name of the artifact at Curator@AeroAntique.com.

This is a WWII-era 24-hour 8-Day Aircraft Clock, USN stock number R88-C-570-10, made by Jaeger for use in aircraft of the US Navy, such as the PBY Catalina, TBM Avenger, and F4U Corsair.  Known as the Jaeger LeCoultre A-10 Chronoflite Elapsed Time Clock, this version has the functions of Elapsed Time, Center Seconds Chronograph, and Civil Date Function.

A colleague offers this explanation of its operation:

The button on the right starts the large sweeping hand (seconds) and the lower dial (minutes, counterclockwise). If you press the right button again, the timer will stop. Then press it again and it will reset.
The other timer is more interesting and very convenient.

Push the left button. When the top flag is red, and the bottom flag is red, the top timer is running (minutes, hours). To pause the top timer rotate the center knob until the bottom flag is white. To resume the top timer, rotate the center knob until the bottom flag is red again.

When you’re done with the top timer press the left button again. The top flag will turn red and white (stopped). Then if you press the left button again it will reset.

The cool thing is that if you’re paused and you reset the top timer with the left button the center knob will actually move so that the bottom flag is red (so that the timer actually starts and isn’t paused the next time you press the left button).
The clock is mounted in a what seems to be a lexan stand. The faceplate of the stand show markings which translate the 24 hour military time to the 12 hour civilian standard. 
The clock winds and runs, but not for a full eight days. We have not attempted to test the clock's other functions. It is in terrific condition given its age.  The white service label, partially scratched, shows evidence of this clock having been through NAS (Naval Air Station) Norfolk (VA). 

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