I found a wristwatch that indicates the eot on a scale that (presumably) can be read to a fraction of a minute. The scale goes halfway around the circumference of the dial.
Go to this page: http://farlang.com/watches and scroll down to Audemars Piguet Jules Audemars The first illustration shows the movement with the kidney piece at the lower right. The third illustration shows the dial - which is difficult to read on the page - see the attached. The accuracy of the kidney piece will determine the accuracy of the reading. Bob
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