First thing, before you panic: your watch is probably fine. An automatic that gains or loses a few seconds a day isn't broken — that's just what mechanical watches do. If you came from a quartz watch that was dead-on for years, the drift feels alarming. It isn't. It's the trade you made for a tiny machine on your wrist instead of a battery.
The short version: a few seconds a day is normal. Know your movement's spec, rule out magnetism first (it's usually the culprit), and only worry if it's way outside the numbers below.
How much drift is actually "normal"?
This is where most people freak out over nothing. Automatics are rated in seconds per day, and the acceptable window is wider than you'd think:
| Watch | Typical accuracy |
|---|---|
| COSC-certified chronometer | −4 / +6 sec per day |
| Good everyday automatic | ~ −10 / +20 sec per day |
| Seiko NH35 / entry automatic | −20 / +40 sec per day (in spec!) |
| Quartz (for contrast) | ~ ±0.5 sec per day |
So if your automatic is running +8 a day and it's driving you nuts — that's a genuinely good result. The r/Watches reflex when someone posts "help, my watch runs fast" is almost always the same: that's within spec, wear it and relax.
The real reasons it's off (in order of likelihood)
- Magnetism. The number-one fixable cause, and almost nobody suspects it. Your watch sits next to phones, laptops, speakers, tablet covers, and magnetic phone mounts all day — magnetize the hairspring and it can suddenly run minutes fast. The fix is stupidly easy: a demagnetizer ($10 tool, or free at most watch shops) resets it in seconds.
- The position you rest it in overnight. A mechanical watch runs at slightly different rates dial-up vs crown-down vs crown-up. If it gains time, rest it in a position that loses (crown up), and vice-versa. You can basically hand-tune it on your nightstand — a classic enthusiast trick.
- You're not wearing it enough. Automatics wind from wrist motion. Desk job + taking it off midday = the mainspring runs down, amplitude drops, and it loses time. Wear it consistently, or give the crown 20–30 winds to top it off.
- It needs regulating or a service. If it's genuinely way out of spec (think ±60+ a day), the movement may need regulation on a timegrapher, or the oils have dried out and it's due for a service.
- Temperature and shocks. Big heat swings and hard knocks both nudge the rate. Minor, but real.
Wait — why is my watch even this imprecise?
Quick history, because it explains everything. In 1969 Seiko released the Astron, the first quartz wristwatch. Quartz was accurate to a fraction of a second a day and cheap to make — and it gutted the Swiss mechanical industry through the 1970s and '80s. This is the Quartz Crisis: hundreds of Swiss firms folded and industry employment collapsed to a fraction of what it had been. Mechanical watchmaking nearly died because, on pure accuracy, it simply lost.
What saved it was a reframe. The survivors (and the group that became Swatch) stopped selling mechanical watches as the most accurate option and started selling them as craftsmanship — heritage, artistry, a living machine you wind with your own motion. So when your automatic drifts +10 a day, that's not a defect. It's a feature of the exact thing that survived the crisis by being about soul, not specs. If you want dead-accurate, that's what quartz is for — and honestly, owning one of each is the move.
How to actually fix it (do these in order)
- Demagnetize it. Cheap, instant, solves it more often than anything else. Start here.
- Wind it fully and wear it daily for a week. Rule out low power reserve before you assume it's broken.
- Experiment with resting position overnight. Nudge the daily rate toward zero for free.
- If it's still way out of spec, get it regulated or serviced. A watchmaker on a timegrapher dials it in.
The mistakes people make
- Expecting quartz accuracy from a mechanical watch. Different tools. If ±10 a day ruins your week, wear a quartz.
- Never demagnetizing. People send watches in for service when a $10 demagnetizer would've fixed it.
- Letting it sit in a drawer. An unworn automatic winds down and "loses time" simply because it stopped.
- Chasing perfect zero. Even great automatics drift a little. In spec is the goal, not a stopwatch.
FAQ
Is it bad if my automatic loses a few seconds a day?
No — that's completely normal. Most automatics are rated for several to a couple dozen seconds a day. It's the nature of a mechanical movement.
Why did my watch suddenly start running fast?
Almost always magnetism. Something magnetized the movement. Demagnetize it and it usually snaps right back.
Does wearing it more make it more accurate?
Often, yes. Consistent wear keeps the mainspring wound and amplitude up, which stabilizes the rate. A sitting automatic loses time as it winds down.
When should I actually get it serviced?
If it's far outside its rated spec, stops easily, or it's been 4–6+ years, it's time for a regulation or full service.
Which is more accurate, automatic or quartz?
Quartz, by a mile — that's literally the history above. Buy automatic for the craft, quartz for the precision. 1GW automatics for one, the Affordable Watch Club for the other.
One good watch, or a club full of fun ones — either way, welcome in. Reviewed and curated by the One Good Watch team.