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Watch Running Fast: Causes, Home Checks and Fixes
A watch that runs fast is usually telling you one of four things: it has picked up magnetism, it has had a knock, its oil has aged or migrated, or it simply needs regulating. Some gain is normal for a mechanical movement. A sudden jump to a minute or more a day is not, and it is worth acting on before the movement wears.
This guide shows you how to measure what your watch is really doing, which causes you can rule out yourself, and when to stop and hand it to a watchmaker. It also covers the related complaints readers raise alongside it: an automatic that stops overnight, one that will not wind, and one that still gains time after a service.
TL;DR
Measure before you worry: check the watch against a reliable time source over several days, then divide the seconds gained by the number of days.
A steady gain of a few seconds a day is normal for many mechanical watches. A sudden, large gain points to magnetism, a shock or a hairspring problem.
Keep the watch away from phone speakers, magnetic clasps, laptop bags and induction hobs, but do not open the case yourself.
If the gain is above about 20 seconds a day, erratic, or followed a knock, take it to a qualified watchmaker.
A watch that still runs fast after a service should go back to the workshop that serviced it, with your measurements.
Table of Contents
How much gain is normal for an automatic watch?
A mechanical watch is never perfectly accurate. Grand Seiko, which publishes unusually tight figures, gives its 9S68 movement a normal-use specification of −1 to +10 seconds per day. That is a high-grade, finely adjusted calibre. Most watches are allowed a wider margin.
The practical point is that the allowed tolerance depends on the movement and on how the maker adjusted it. A chronometer-grade watch should sit in a narrow band. A standard-grade watch from the same brand can legitimately drift further. Check your warranty card or the maker’s specification for the figure that applies to your model, rather than comparing against a friend’s watch.
There is a second point that catches people out. Mechanical accuracy is affected by gravity, temperature and shock, so a single day tells you very little. Grand Seiko’s own guidance is that accuracy should be judged over a week to ten days in normal wear, and that you should never judge a mechanical watch on one day’s performance.
As a rough guide for everyday use:
What you measure | What it usually means |
A few seconds fast per day, steady | Normal for most mechanical watches |
Around 10 to 20 seconds fast per day | Within tolerance for some calibres; a regulation is worth considering |
More than 20 seconds fast per day | Time for a watchmaker’s assessment |
Minutes fast per day, or a sudden change | Likely magnetism, a shock or a hairspring fault; stop relying on the watch |
The thresholds are guidance, not a verdict on your particular movement. The trend matters more than any one reading: a watch that ran steady for years and then suddenly changes is a stronger warning than one that has always gained a little.
How to measure the rate at home
You do not need special equipment. You need patience and consistency.
Set the watch against a reliable reference. Your phone’s clock, which takes its time from the network, is fine. Set the seconds hand to match as closely as you can and note the time.
Fully wind it. If it is an automatic, wear it for a normal day or wind it by hand first, so you start from a consistent power level.
Record how you leave it. Note whether it sits dial up, crown down, or on your wrist overnight. Keep the routine the same each night.
Compare after 24 hours, then again after several days. Divide the seconds gained by the number of days. A watch that is 18 seconds fast after three days is gaining 6 seconds a day.
Repeat with a different routine. Wear it for a week, then rest it dial up for a week. If the numbers differ a lot, position and wearing pattern are driving the result, which is normal behaviour rather than a fault.
Write the readings down. A short log of dates, positions and offsets is the single most useful thing you can hand to a watchmaker, and it speeds up the diagnosis.
Why a watch runs fast
The heart of the problem is almost always the balance system: the balance wheel and the hairspring that controls its swing. If the hairspring effectively becomes shorter or stiffer, or the balance swings differently, the watch gains. Here are the usual reasons.
Magnetism
Magnetism is the classic cause of a sudden, large gain. When the hairspring becomes magnetised, its coils can cling together, which shortens the working length of the spring and makes the watch run fast. British GQ lists magnetism from phones, clasps and induction hobs among the everyday sources.
Think about where the watch has been. Resting beside a tablet cover with a magnetic closure, a speaker, a handbag clasp or a fridge door are all ordinary routes. If the change was abrupt and followed one of these, magnetism becomes the leading suspect. The good news is that demagnetising is a quick job for a watchmaker, and it is usually one of the cheaper fixes.
A knock or shock
A drop, a knock against a door frame or heavy impact in sport can disturb the balance system. GQ notes that a shock can knock the hairspring out of adjustment. Workshop guidance published by the NAWCC also describes a fault called knocking, where the balance wheel swings with too much amplitude and the impulse pin strikes the pallet horns. It can cause a significant gain in time and an unstable rate.
If the watch began running fast after an impact, do not keep wearing it hard. Continued use with a disturbed hairspring can add wear.
Oil migration and ageing lubricants
Oil is meant to stay on the pivots and jewels. Over the years it can degrade, and it can also spread. GQ points to lubricant migrating onto the hairspring as another way a watch ends up gaining. Oil on the coils makes them stick, again shortening the spring.
This is a reason the usual advice is regular servicing. Where a movement has gone many years without attention, a gradual change in rate is a prompt to book it in, even if nothing else seems wrong.
Regulation drift
Even with no knock or magnetism, the rate can move. Small changes in the movement, the oils and wear on parts shift the average over time. The regulator, the small lever that adjusts the effective length of the hairspring, can be moved slightly to bring the rate back. This is precise work done on a timing machine, not something to try by feel.
Wearing habits and position
How you wear the watch also changes the rate. Wearing time, power reserve, the position it sits in overnight and temperature all play a part. Christopher Ward’s manual makes the related point that accuracy depends largely on the power reserve, which in turn follows how active the wearer is. A watch that gains on a fully wound day and loses when nearly run down is behaving normally.
That is also why a single position test is of limited value. If your watch gains a little when worn and loses a little on the nightstand, the two can cancel out over a week.
Safe checks you can do yourself
There is a short list of things worth trying, and a longer list of things to leave alone.
Worth trying:
Move it away from magnets. Keep it off speakers, magnetic cases and kitchen appliances for a few days and measure again. Mild magnetisation may not clear on its own, but you will rule out an ongoing source.
Check the day-to-day routine. Is the watch resting in a different position than before? Has your activity pattern changed?
Log the rate for a week. This separates a real fault from normal variation.
Think back to any recent knock. Mention it to the watchmaker, even if it seemed trivial.
Avoid changing the date at the wrong time. Many automatics should not have the date set in the evening and early hours. Christopher Ward advises avoiding changes between roughly 20:00 and 02:00, when the date mechanism is engaged. It will not cause running fast, but it is an easy way to cause a second problem.
Leave alone:
Opening the caseback to touch the regulator or the hairspring.
Home demagnetising gadgets of uncertain quality, which can leave the movement in a worse state.
Repeated winding and setting experiments that disturb a movement you are trying to diagnose.
A movement is a sealed set of tiny parts, and a hairspring bent by a fingertip is an expensive mistake.
When to take it to a watchmaker
Book a professional assessment if any of the following apply:
The watch gains more than about 20 seconds a day over several days. The UK testing guidance we reviewed gives this figure as the point to seek service or regulation when the rate is off or erratic.
The rate is erratic, fast one day and slow the next, with no change in how you wear it.
The change began suddenly, or after a knock or a suspected magnetic exposure.
It has gone several years without a service.
You can see hairs or particles under the crystal, or the seconds hand jumps oddly.
A workshop will usually test the rate in several positions on a timing machine, check for magnetism, and look at the hairspring and balance. If the cause is magnetism, that may be all it needs. If the hairspring or lubrication is at fault, a full service is the proper answer.
Automatic watch not winding or stopping overnight
Two other complaints often arrive with a rate problem, and they have simpler explanations than most owners expect.
The watch stops overnight
An automatic stores energy only while you move. If you have a quiet, desk-bound day, the mainspring may not take on enough charge, and the watch can run down while it rests. The fix is often a habit rather than a repair: wind the watch by hand each morning, wear it for longer, and see how many hours it runs after a full wind. If it runs well under its stated power reserve, take it in. If it simply needs more activity than your day provides, a watch winder or a regular manual wind will help.
Watchmakers regularly see “faults” that are really about starting. Many automatics need a manual wind of around 40 turns of the crown before wear, rather than starting from flat and expecting the wrist to do all the work. Wind clockwise, gently, and stop when you feel firm resistance. Check your manual, because some crowns and models differ.
The watch will not wind
If the watch will not take a charge from wrist movement, the self-winding system may be at fault. NAWCC guidelines name a blocked or non-free rotor and defective parts such as the reverser or sliding wheel spring among the causes. Listen for a faint rotor swish when you gently rotate your wrist. If the rotor sounds scraping, rattles or is silent while the watch fails to hold charge, it needs a workshop.
The difference matters: a gaining watch has a rate problem, a stopping watch has an energy problem. They can coincide on an old movement, but diagnosing them separately saves money.
Still running fast after a service?
This is frustrating, and it deserves a calm, structured approach.
First, allow for settling. A freshly serviced movement and new oil can take a little while to settle, and rates can shift slightly in the first days of wear. Measure over a week before concluding anything.
Second, think about what happened after collection. A watch can be magnetised by a phone in a pocket on the way home, or knocked in the first week. If the rate changed on a particular day, say so.
Third, go back to the workshop that did the work, with your log. A reputable workshop will usually re-check a rate after service, since regulation is part of the job, and a short return for a timing adjustment or demagnetisation is common. Tell them the measured gain per day, the positions you left it in, and any events since collection. Ask what the timing readings were when it left the bench.
Finally, keep records. A clear service history protects the value and authenticity of a watch, and it makes follow-up work simpler. If parts were replaced, it also helps to know whether they were original, as aftermarket parts can put provenance at risk for collectors.
Our view: what a gaining watch really needs
We handle high-end watches every week, and the pattern is consistent. Owners tend to jump to the worst case, an expensive movement failure, when the cause is often magnetism or a simple regulation. Others leave a gaining watch running for years because it “still looks fine”, and the wear that follows is avoidable.
Our advice is plain. Measure it properly over a week. Keep it away from magnets. If the gain is large, sudden or erratic, stop wearing it daily and have it checked by a qualified watchmaker. Do not wait for a full failure, and do not experiment on the movement yourself.
We also look at it as dealers. A watch with a documented, regular service history is easier to value and easier to sell, and a rate problem fixed early costs far less than one left to wear the pivots. If you are weighing whether a service is worth it on an older piece, think of it as maintenance on a long-lived asset rather than an expense.
— Lewis
Servicing your watch with Horology Kings
If your watch is gaining time and you want it assessed by certified horologists, we service and repair a range of luxury brands. Our published starting prices are from £500 for Rolex, £450 for Omega, £400 for Breitling, and £350 each for Tag Heuer and Cartier, with polishing from £100. The final cost depends on the watch and what it needs, so see the details on our watch repair and servicing page.
If the repair would cost more than you want to spend on a watch you no longer wear, you may prefer to sell. We offer a free valuation on our sell a watch page, and we can also help if you are looking to source a particular watch. Before you decide, it helps to know what valuations cost in the UK.
FAQ
How many seconds a day is too fast for an automatic watch?
It depends on the movement. High-grade calibres can be specified at around −1 to +10 seconds a day, while standard movements are allowed a wider range. As a working rule, a steady gain above about 20 seconds a day, or any sudden change, deserves a watchmaker’s assessment.
Can a magnetised watch fix itself?
Usually not. A magnetised hairspring tends to stay that way until it is demagnetised, and keeping the watch away from the source only stops it getting worse. A watchmaker can test for magnetism and remove it quickly.
Why does my automatic watch gain time on the wrist but lose it at night?
Position and power reserve change the rate. Wrist movement keeps the mainspring more fully wound and the watch moves through many positions, while a watch resting overnight sits in one position with a falling charge. If the two largely cancel out over a week, the watch is behaving normally.
Is it worth servicing an older watch that runs fast?
Often, yes. A gain caused by ageing oil or wear is unlikely to improve alone, and further running can add wear. A service by a qualified watchmaker usually costs far less than replacing worn parts later, and it keeps your service history complete.
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