The Dubois-Dépraz 2020 chronograph module is fully jewelled, so should be no problem leaving the chrono running (provided it actually
has been properly checked and lubed). However you still need to get the base movement checked over. It's based on the ETA 2890-A2 and is well known and normally reliable. Make sure you're sitting down when you phone for a quote on a full service
That's the way to do it!
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