Below are scans from the original War Department publication AN 05-35A-8, Handbook of Instructions with Parts Catalog for Navigation (Hack) Watch, 10 April 1945, a joint publication of the USAAF, USN, and RAF.
It contains instruction for the care and maintenance of the Waltham A-11 wristwatch issued for air navigation and includes complete servicing and adjustment instructions.
It’s interesting to see that the accuracy tolerance was a mere +/- 30 seconds in two positions, which starts to make on realize exactly how accurate modern watches are.
Click on the images below for a larger view.
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