RE: [Demo notebook] QC clinic: photographic evidence and its limits · RWI-02313

Case 33 — Maintenance question: how do I tell if an automatic actually needs service?

Clarifying question first: do you have a baseline? If you've never recorded the watch's rate or power reserve, 'drifting' is hard to judge. Start a simple log now with daily offset against a reference time for a week, and the hours it runs from full wind. Once you have that, later changes mean something.