RE: [Demo notebook] QC clinic: photographic evidence and its limits · RWI-00645
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BenchNotes 06501Case 45 — Maintenance question: how do I tell if an automatic actually needs service? · source wording exercise
Common advice says service every five years, but service is expensive and some people run watches much longer. What observable signs actually indicate a mechanical watch needs attention, as opposed to just being due on a calendar?
Review focus: source wording. Retain the source wording beside any paraphrase. Use the original answer fragment “Useful signs, in rough order of seriousness: power reserve noticeably shorter…” as the discussion anchor; no new event or result is supplied.
Exercise RWI-00645/45: address this question within its stated limits.