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I cannot find anything stating what the accuracy or tolerances are for the MB 24.15 movement (based on Sellita SW 200-1), nor can I find which grade of that movement Montblanc uses (so I can at least have an educated guess). Anyone know or have some estimates in seconds per day? Thanks!
 

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If you call the Richemont service center, they should have internally documented tolerances for the movements. I had an issue with my IWC 3714 (ETA 7750 movement) where it went from +1 a day to +3 a day. I called and spoke with a rep who told me the tolerance for the movement.
 
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