RE: [Demo notebook] QC clinic: photographic evidence and its limits · RWI-12289
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June 17, 2021 at 5:42 am
#97221
ReferenceLog 04080Participant
Case 29 — 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.