A mechanical watch losing time is frustrating, but it's rarely mysterious. Most timekeeping issues have identifiable causes, and many are straightforward to address.
Understanding why a watch runs slow helps you know when to act, when to wait, and when professional attention is necessary.
Magnetization
Magnetization is the most common cause of sudden timekeeping problems. Modern life is full of magnetic fields: smartphones, laptop speakers, magnetic clasps on bags, and wireless chargers all generate enough magnetism to affect a watch movement.
When a watch becomes magnetized, the hairspring coils stick together, shortening its effective length and causing the watch to run fast. Less commonly, other components can be affected, leading to erratic timekeeping or complete stoppage.
A watchmaker can demagnetize a watch in seconds using a demagnetizer. If your watch suddenly starts losing or gaining significant time, magnetization is the first thing to check.
Needs servicing
Mechanical watches require regular servicing, typically every 5 to 7 years for modern pieces and more frequently for vintage watches. As lubricants age, they thicken, dry out, or migrate, increasing friction and slowing the movement.
If your watch has gone years without service and gradually loses more time, worn lubrication is likely the issue. The solution is a complete service: disassembly, cleaning, fresh lubrication, and regulation.
Delaying service when it's needed can lead to increased wear and more expensive repairs later. Learn more about how often you should service a mechanical watch.
Insufficient power reserve
Automatic watches wind themselves through wrist movement. If you're not wearing the watch enough, or your activity level is low, the mainspring may not stay fully wound.
A partially wound watch can lose time as the power reserve drops. This is normal behavior, not a defect. The solution is either wearing the watch more consistently or manually winding it periodically.
If you rotate multiple watches, consider whether each gets enough wrist time to maintain power. Some collectors use watch winders for pieces they don't wear daily, though this isn't strictly necessary for most watches.
Position variation
Mechanical watches don't run at exactly the same rate in all positions. A watch might gain time when lying flat and lose time when vertical. This is normal and happens because gravity affects the balance wheel differently depending on orientation.
Watchmakers regulate movements to average out these position variations, aiming for consistent overall timekeeping. If your watch runs slower at night when resting on a nightstand versus during the day on your wrist, position variance is the explanation.
For most wearers, this averages out naturally and isn't a concern. If variation is extreme, regulation during service can improve it.
Temperature changes
Temperature affects the metal components in a watch movement, particularly the balance spring. Older watches without temperature-compensating hairsprings can lose or gain time in extreme heat or cold.
Modern watches, especially those with silicon or nivarox hairsprings, are less affected but not immune. If timekeeping shifts seasonally or in different climates, temperature may be a factor.
This is rarely something requiring repair unless accuracy is drastically affected.
Impact or shock
A hard impact can knock a movement out of regulation, damage pivots, or shift components. Even watches with shock protection systems can be affected by severe impacts.
If a watch starts losing time immediately after being dropped or knocked, internal damage is possible. A watchmaker should inspect the movement to identify and repair any affected parts.
Worn or damaged components
Over time, mechanical components wear. Pivots can become damaged, jewels can crack, and gear teeth can wear down. Any of these issues can cause timekeeping problems.
This type of wear develops gradually and typically shows up during routine service. If caught early, repairs are usually manageable. If ignored, damage can spread to other parts of the movement.
Improper regulation
Sometimes a watch loses time simply because it wasn't regulated correctly during its last service. Regulation is an adjustment process, and even skilled watchmakers sometimes need to make fine-tuning corrections after a watch has been worn for a few weeks.
If a recently serviced watch consistently loses time, the watchmaker can adjust the regulator to correct it. This is a quick fix and often done at no charge if the service was recent.
What to do if your watch loses time
Start by noting how much time is lost and over what period. A few seconds per day is normal for most mechanical watches. Losing several minutes daily suggests a problem.
Check for magnetization, especially if the issue appeared suddenly. Many watch repair shops offer free magnetism checks.
If the watch hasn't been serviced in years, service is likely needed. If it was recently serviced, contact the watchmaker to discuss regulation.
For vintage watches, some timekeeping variance is expected and acceptable. Modern chronometer-grade watches should stay within -4 to +6 seconds per day.
Final thought
A watch losing time isn't always cause for concern, but it's worth understanding why. Most causes are fixable, and addressing them early prevents more serious issues.
Regular servicing, reasonable care, and choosing a qualified watchmaker when repairs are needed keep timekeeping reliable for decades. Learn more about choosing a watch repairer you can trust.
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