How Often Should You Service a Mechanical Watch?
Servicing advice splits into two camps that rarely acknowledge each other. Manufacturers publish intervals partly on engineering grounds and partly on liability and revenue grounds. Independent watchmakers frequently argue that a well-running watch left alone outlasts one opened every five years. Both positions contain something true.
What does a service actually involve?
Full disassembly of the movement, ultrasonic cleaning of every component, inspection for wear, replacement of worn parts and gaskets, relubrication with the correct oils at each friction point, reassembly, regulation across positions and pressure testing of the case. It typically takes several weeks.
The core purpose is lubrication. Watch oils degrade and migrate over years, and once a pivot runs dry the wear accelerates from negligible to expensive. Most of what a service prevents is not a sudden failure but the slow scoring of components that then need replacing.
How do you know a watch needs servicing?
The reliable signals are a sudden change in accuracy, a power reserve noticeably shorter than specification, a rotor that feels gritty or noisy, moisture under the crystal, or a chronograph whose pushers have become stiff. Any of these justify a visit regardless of how recently it was serviced.
Accuracy drift is the most useful early indicator because it is measurable. A watch that ran at plus three seconds a day for years and now runs at plus twenty has changed internally. Keeping a rough record of daily rate costs nothing and turns a vague suspicion into evidence.
Why have service intervals lengthened?
Synthetic lubricants replaced natural oils and degrade far more slowly, while tighter manufacturing tolerances and better gaskets reduced contamination. Brands that once advised three to five years now commonly quote five to ten, and some flagship calibres are marketed with longer intervals still.
This makes older advice actively misleading. A guideline written for a 1970s calibre using natural oils does not describe a movement made in 2020. Check what the manufacturer says for your specific reference rather than applying a general rule you read somewhere.
Does an unworn watch still need servicing?
Yes, and sometimes sooner. Oils degrade and can congeal whether or not the watch runs, and a movement left stationary for years may have lubricant pooled away from where it is needed. A watch in a drawer is not preserved; it is simply ageing without being observed.
Running a stored mechanical watch occasionally, or keeping it on a winder at modest settings, distributes lubricant and reveals problems while they are small. The counterargument is that running adds wear, which is true, though far less costly than a dry restart after a decade.
Key takeaways
- Modern intervals commonly run five to ten years, longer than older guidance suggests.
- A service is fundamentally about relubrication before dry pivots cause wear.
- Accuracy drift, short power reserve and moisture are the signals that matter.
- Check the manufacturer figure for your specific calibre rather than a general rule.
- Stored watches still age, and lubricant degrades whether or not the movement runs.
Frequently asked questions
- How much does a mechanical watch service cost?
- It varies enormously with brand and complication, from a few hundred for a simple three-hand movement at an independent watchmaker to several thousand for a complicated piece at a manufacturer service centre. Chronographs and perpetual calendars cost substantially more than time-only watches.
- Should you use the manufacturer or an independent watchmaker?
- Manufacturer service guarantees genuine parts and preserves warranty, and for some brands parts are only supplied to their own network. A skilled independent is often cheaper, faster and more willing to preserve original finish rather than replacing worn parts. Both are legitimate depending on the watch.
- Does servicing hurt a vintage watch’s value?
- It can, if the service replaces original components or refinishes the case and dial. Collectors value originality highly, and an over-polished case or replaced dial can reduce value considerably. Ask explicitly for original parts to be retained and returned, and decline cosmetic refinishing.
- Do water resistance gaskets need replacing at every service?
- Generally yes. Gaskets are inexpensive, they harden and compress over years, and they are the main defence against moisture. Any service that includes pressure testing should include fresh gaskets, and a service that skips them has not restored the case seal.
Watchmaking & Reference, BigBalli. We maintain specification and movement data across thousands of references, cross-checked against COSC, ISO standards and manufacturer documentation.