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My SBGM221 has -3 5 and 72 hours PWR so how is this really a significant improvement?

 

I do find these tech specs somewhat odd given that a hi beat movement should be more accurate than one running at a lower rate such as my 9S6 series movement yet is quoted at the same rate. Rolex specify-2 2 (which is the tightest specification of all manufacturers) so isn’t it time GS set their rates to at least the same? The Breguet overcoil and the new escapement are nice features to have on paper but in reality often don’t translate into real world improvements.

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