"The Famous 100,000 Consecutive Omega 561 Chronometers" ??

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I never knew this, turns out the Ref.167.005 I'm about to part with falls in this serial range!
 
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And at this point Rolex weren’t even making their own movements!
 
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Mines a 551, oh well. had to look back at photos from 4 years ago to double check the movement. Haven’t opened it since Archer did some rehabilitation on it.