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A-11 Navigation (Hack) Watch Manual

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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18 Responses

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  1. Tom Murdoch says

    I have an affiliate site that’s in dev right now.

    I am populating it with content (not exclusively) that’s out of the main streamn, and I’d like to use some of your content on the A11 military watches,

    with proper credit.

    Ok with you?

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