It's job was not simply telling time—it was a navigation instrument.
Accurate time was essential for celestial navigation, dead reckoning, speed calculations, and synchronizing operations in World War 2.
TS5000 MFR’S PART NO. 33106 AN5740 1941 HAMILTON WATCH CO.
In World War 2 pocketwatch accuracy was a matter of life and death for example a 30-second timing variance at 300 mph — resulted in exactly 2.5 miles off target.
The accuracy of this Military Issue 4992B 22 jewels Hamilton U.S.A. was essential for Army Air Corp Navigation Officer's in WW2. This was "the watch that helped win the war" for Allied Forces.