RE: [Demo notebook] Reference notebook: corrections and recurring beginner questions · RWI-12476

[PartsReader 05198]

Case 22 — 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-12476/22: address this question within its stated limits.