AN 5740 Master Navigation Chronometer

Many Army Air Forces navigators in World War II carried a chronometer set to Greenwich Civil Time (later Greenwich Mean Time) and mounted in a special hardened case with shock absorbing springs. 

Caption:
One of the most common navigation watches produced, with many used by the U.S. military well into the Cold War era.
Type: Artifact
Image Date: 2012
Credit: National Air and Space Museum, Smithsonian Institution
Origin: National Air and Space Museum, Smithsonian Institution
Creator: Eric Long
NASM2012-02164

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nasm2012-02164.jpg

One of the most common navigation watches produced, with many used by the U.S. military well into the Cold War era.

nasm2012-02165.jpg

One of the most common navigation watches produced, with many used by the U.S. military well into the Cold War era.