Why a newly serviced watch can show shorter reserve, and when it is normal versus a problem.
If a serviced watch is expected around 40 hours and a true full-wind test reaches the mid-30s with clean running, that can still be a normal real-world band. A full-wind result near 20 hours is a reason to contact the service centre.
• Owners often test after partial wear, not true full wind.
• Brochure numbers are ideal-case figures.
• Early post-service judgments should use clean measurement method.
• A real large shortfall still deserves a call to the service centre.
This is educational triage. The service centre’s stated result and movement type remain the main reference.
Why is my watch power reserve shorter after service?Measurement method, normal claim variance, or a real shortfall can all explain it.
How should I test power reserve after service?Full wind, leave untouched, record hours to stop.
When should I contact the service centre about short reserve?When a true full-wind test falls far below expected reserve.
Is a small shortfall after service normal?Often yes. Large shortfalls are not.