Measure second hand.

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How does Omega measure the length of the second hand. Need a new hand for a 166.110 . But can't find a number. The old one is 12,5 approx center-end . And i found one 12,7. But do they mean the complete length or center-end when they say 12,7 mm
 
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Hands are measured from the center of the mounting hole or tube, out to the tip. This is industry standard practice.
 
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Hands are measured from the center of the mounting hole or tube, out to the tip. This is industry standard practice.
Thought so to . But just wanted to double check.