RE: [Demo notebook] Workbench questions: what to record before asking for service · RWI-18239

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Case 19 — Maintenance question: how do I tell if an automatic actually needs service?

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?

Exercise RWI-18239/19: address this question within its stated limits.