Everyday objects can magnetise a mechanical watch and make it run fast. Answer a few questions about your habits to see your risk level and get practical advice.
When certain parts of the movement (especially the hairspring) become magnetised, the coils can stick together. This effectively shortens the hairspring and makes the watch run faster — sometimes several minutes per day.
Modern watches with silicon hairsprings or soft-iron inner cases are far more resistant, but most standard mechanical watches can still be affected by everyday magnets.
Option 1 – Inexpensive demagnetiser tool
Small electronic demagnetisers are widely available. Follow the device instructions (usually pass the watch slowly through the field a few times).
Option 2 – Watchmaker
Any competent watchmaker can demagnetise a watch in less than a minute and can also check rate afterwards.
High risk: MRI machines, large speakers, strong industrial magnets, magnetic phone cases pressed against the watch
Moderate risk: Phone in same pocket daily, laptop speakers, magnetic bag clasps
Low risk: Normal desk distance from electronics, occasional phone use, modern anti-magnetic watches
Can my phone really magnetise a watch? Yes. Modern phones contain magnets (speakers, haptic motors, MagSafe-style rings). Keeping a phone in the same pocket as a mechanical watch for long periods can eventually magnetise some movements.
Why does a magnetised watch run fast? Magnetism causes the hairspring coils to stick together, shortening its effective length. A shorter hairspring oscillates faster, so the watch gains time.
Are Rolex and Omega immune? Many modern Rolex and Omega models have strong anti-magnetic protection and are highly resistant to everyday magnets. They are not completely immune to very strong fields (such as MRI).
How do I know if my watch is magnetised? The most common sign is that it suddenly starts running significantly fast (often several minutes per day). A watchmaker can confirm with a simple test.
Is demagnetising safe? Yes when done correctly. A proper demagnetiser or a watchmaker will not harm the watch.
Should I demagnetise regularly? No. Only demagnetise when there is a clear symptom (usually sudden gaining) or after known strong magnetic exposure.