The most expensive surprise in watch ownership is not the purchase, it is the first service. Prices vary widely, timelines can run to months, and the work is usually described in a phrase — “full service” — that explains nothing. Here is what actually happens inside a mechanical watch service, when it is worth doing, and what moves the number up or down.
What a service is
A conventional mechanical service is a set of operations performed in a fixed order:
- The movement is removed from the case and partly or fully disassembled.
- Parts are cleaned — by hand, in an ultrasonic bath, or both, depending on the component.
- Worn components are assessed and replaced: mainspring, gaskets, sometimes jewels, wheels or a balance staff.
- The movement is reassembled with fresh lubricants at each specified point.
- Timing is checked and the rate regulated, ideally in several positions.
- The case and bracelet are cleaned, and refinished if you have asked for it.
- The watch is reassembled and pressure tested for water resistance.
Two items sit outside the standard scope and should be agreed before work starts. Refinishing is cosmetic and removes metal. Replacing parts that are worn but still functional — a dial with a spot of patina, hands with lume loss, a scratched crystal — is a judgement call that affects whether a watch stays original.
When a service is due
Manufacturers commonly publish intervals somewhere in the range of five to ten years, and the spread is not carelessness: a modern movement with a large power reserve and low beat rate has different requirements from an older high-frequency calibre.
Time is only one input. A watch that runs within its stated tolerance, winds smoothly, sets cleanly and shows no fogging after temperature changes does not need to be opened solely because a number of years has passed. Service for a reason:
- Rate drift that gets worse over weeks rather than days.
- A rotor that grinds, wobbles or spins oddly.
- Rough or gritty winding, or a crown that no longer engages cleanly.
- Moisture or fogging under the crystal, which is urgent — water causes corrosion quickly.
- A hard knock, followed by a sudden change in timekeeping.
- A chronograph that starts, stops or resets imprecisely.
Waiting for symptoms is a defensible strategy, with one caveat. Lubricant dries out and contaminated oil accelerates wear, so a watch that has run for fifteen years untouched may need more parts than one serviced at a sensible interval. The balanced position is an assessment by a watchmaker rather than either an automatic overhaul or indefinite neglect.
What drives the price
Servicing cost tracks complexity and parts, not brand status per se:
- Movement architecture. A three-hand automatic is the simplest case. A chronograph has more components and more interfaces. A calendar, a perpetual calendar or a tourbillon multiplies both the part count and the skill required.
- Parts availability. A movement for which an independent watchmaker can order parts is cheaper to service than a proprietary calibre that must go back to a service centre, potentially in another country.
- Where it goes. A brand service centre generally has the parts, the tooling and a warranty on the work, and generally charges the most and takes the longest. An independent watchmaker is often cheaper, quicker and more communicative, but may be blocked from parts supply.
- Extras. Refinishing, crystal replacement, dial or hand restoration, strap replacement, new crown or pushers.
- Vintage complications. For older watches, some parts are simply not made any more, and the choice is between acceptable wear, a donor part of uncertain origin, or reverse-engineering a component at significant cost.
Quartz watches are usually simpler: a battery, new gaskets where needed, and a pressure test. When a quartz movement fails, replacement rather than repair is normal, which is cheap while the movement is still in production and a dead end when it is not. Solar, kinetic and GPS models have capacitors or rechargeable cells that age, and battery leakage damage is expensive — usually beyond economic repair.
Choosing who does the work
Ask three questions before handing anything over. Does the watchmaker work on this movement routinely? Can they obtain parts? What warranty do they offer on the work, and for how long?
If the answer to parts is no, the watch will come back cleaned but with the worn components left in place, which is a partial service at full price. That can still be worth doing, but it should be your decision rather than a discovery afterwards.
Whoever does the work, specify what you do not want. Many service centres polish by default, and a case that has been heavily refinished loses the crisp edges and flat surfaces that experienced buyers look for, which can reduce value on a collectible watch. Put it in writing: no case refinishing, keep the original dial and hands, return replaced parts.
Before and after
Before: photograph the watch from several angles, write down the serial number, note existing scratches and any issue with the crystal or bezel. Get a written estimate with an itemised scope and an expected turnaround, and confirm whether that estimate can change and by how much.
After: give the watch a week and check it against a reliable time source, confirm the pressure test result in writing, and check that the parts you asked to keep came back. If the watch was serviced to fix a specific fault, verify that the fault is gone before you accept it.
The long view
A service history does not make a watch worth more than a comparable one with a clean mechanical condition, but it does answer a question buyers ask. Keep the paperwork: an invoice showing who did the work, when, and what was replaced is a real asset at resale, in the same way that a missing record is a discount.
The practical approach is to treat servicing as a recurring cost of ownership, budget for it at purchase rather than at failure, and keep control of the parts you would rather keep original.