Reply To: Timing a watch or clock.

[stevefitzwater]

Not sure if this will help you, but give this a review and see if helps at all.

http://www.walthamwatchinfo.com/Helpful_Information_for_Watchmakers.php

There is a .pdf file there you can download to review if the information helps you.

This is a booklet given out by Waltham back in 1939