The Tool Desk
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What “servicing” actually covers
Brands use the word for three different jobs. Read a recommendation closely to see which one it means.
- Maintenance service. Breitling’s FAQ describes this as a function check, replacement of seals, a water-resistance check, and cleaning of the case. Victorinox also separates maintenance from full overhaul work.
- Complete overhaul (or complete service). Breitling describes this as disassembly, cleaning, replacement of standard movement parts, assembly, lubrication, and adjustment. This is the work that addresses the movement itself, including the chronograph module.
- Water-resistance test. A check of whether the case still resists water under test conditions. It does not overhaul the movement. A passing result describes the watch on the day it was tested, not a permanent guarantee.
Because a maintenance service can include seal replacement and a water test, owners often assume it covers everything. It usually does not include a full overhaul. Ask the service center which tier is quoted.
Published intervals by brand
None of the brand pages cited here shows a publication year for its service guidance, so confirm each figure against the current guide for your model before booking work. The table lists movement-service intervals only; water-resistance intervals are covered in their own section below.
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| Brand | Recommended movement interval | What the interval covers | Conditions attached |
|---|---|---|---|
| TAG Heuer | Full overhaul usually every five to six years | Mechanical and quartz watches, per the Chrono Caliber TH80 user guide dated 03.2026 | Depends on wearing habits, frequency of wear, environment, and physical activity |
| Victorinox | Maintenance service every 18 to 24 months; complete overhaul every four to six years | Overhaul applies to mechanical movements | Overhaul timing depends on model, personal use, and local climate |
| Breitling | Maintenance service every two years; complete service every four to six years | Two distinct service tiers, as described in its FAQ | Not stated as a single rule for all models |
| IWC | No fixed movement-service interval stated in its FAQ | Service when performance, function, or timekeeping deviates | Interval depends on wearing habits, environment, and physical activity |
| Patek Philippe | Service every eight to ten years | Quartz and mechanical manual-wound and self-winding watches | Service through an official service center or authorized retailer; confirm the model guide |
| Cartier | Functional check every six years | Functional check; overhaul interval not stated | Service sooner if the watch begins running noticeably fast or slow |
Nothing in these brand publications sets a schedule based on the chronograph function alone. The intervals attach to the brand, the movement, the model, and the way the watch is used. Where two brands disagree, the model guide and the advice of an authorized service center control for your watch. Do not apply the shortest or longest figure in the table to every chronograph you own.
How the maker’s guidance frames the interval
TAG Heuer’s Chrono Caliber TH80 user guide, dated 03.2026, states the principle most clearly: “The necessary interval between services will be determined by your individual wearing habits, frequency of wear, your environment, and the intensity of physical activity you engage in.” The same guide says the brand usually recommends a full overhaul every five to six years for both mechanical and quartz watches. Read that figure as a usual recommendation, not a deadline that applies to every case in the same way.
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Two further factors appear in the brand guidance. Victorinox ties overhaul timing to model, personal use, and local climate. Frequent water exposure, discussed below, affects the water-resistance clock rather than the movement clock.
Water resistance runs on its own clock
A chronograph has more openings in its case than a time-only watch: the crown and two pushers all pass through gaskets. TAG Heuer attributes changes in water resistance to gaskets that age naturally and to impacts affecting the crown, pushers, or crystal. Makers therefore recommend water tests separately from movement service.
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| Brand | Water-resistance test interval | When the guidance applies |
|---|---|---|
| TAG Heuer | Every two years | For watches regularly exposed to water |
| IWC | At least annually | Stated as a minimum test interval |
| Breitling | Approximately yearly | For frequent water exposure |
| Victorinox | Every 18 months, or whenever the case is opened | Applies regardless of water use |
| Patek Philippe | Not stated in the care guidance cited | Follow the model guide |
| Cartier | Not stated in the guidance cited | Follow the model guide |
Use the shortest interval that applies to your watch and your habits. If you have had a long gap since the last test, or the watch has taken an impact, test it before you rely on it in water. A depth marking on the dial or caseback describes the watch as tested and does not guarantee its present-day performance, because seals age and components can be damaged.
Signs that call for service sooner
Do not wait for the calendar when the watch changes behaviour. The brand guidance names two triggers:
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- Deviation in performance, function, or timekeeping. TAG Heuer says service can be arranged when regular performance, function, or timekeeping deviates, and IWC gives the same trigger.
- Noticeable speed error. Cartier calls for service when a watch begins running noticeably fast or slow, and says the movement may then need attention sooner than its six-year functional check.
An impact, or any opening of the case, is also a reason to schedule a water test before the next planned date.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep chronograph pushers out of water
This is a use rule, not a service interval, and it matters most for chronographs. Carl F. Bucherer’s official FAQ states: “To avoid water from penetrating into the watch movement, never operate the chronograph pushers under water.” Patek Philippe and Cartier likewise advise owners not to operate watch controls underwater. A watch with a water rating can still be damaged by pressing a pusher while submerged, so change the chronograph only on dry land.
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Who should carry out the work
The brand guidance points owners to official channels: authorized service centers for overhauls and for water-resistance checks, and an official service center or authorized retailer for Patek Philippe watches. Gaskets and cases are not restored by cleaning or by a generic repair kit, and none of the brands cited suggests that owners should service the movement or the seals themselves. Ask whether the quote covers an overhaul or only a maintenance service, and whether a water test is included.
A practical schedule for one watch
- Find the model-specific service guide on the brand’s site, and note the movement interval and the water-resistance interval it gives for your watch.
- Record the dates of the last overhaul, the last maintenance service, and the last water test.
- Estimate how often the watch meets water, and how heavily you wear it, since both change the water-test timing.
- Book a water test at the shorter of the water-resistance intervals that applies to you.
- Book the movement service when the recommended interval comes due, or sooner if timekeeping, performance, or function changes.
- After any impact, or any time the case has been opened, request a water test before the watch goes back into regular use.
The result is a schedule tied to the maker’s own figures, which is more reliable than any single rule for chronographs.
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