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How quartz and mechanical movements work
Quartz: a battery and vibrating crystal
A quartz watch uses battery current to make a quartz crystal vibrate. Electronics turn those vibrations into electrical pulses, and a stepper motor moves the hands. TAG Heuer explains this sequence in its quartz-movement FAQ; Breitling also describes quartz watches as battery-powered and crystal-regulated.
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Mechanical: stored energy in a spring
A mechanical watch stores energy in a mainspring. A manual movement receives that energy when you wind the crown; an automatic movement uses a winding mass that rotates as you move your wrist. When the stored energy runs out, the watch stops until it is wound again. See Victorinox’s watch FAQ and Chanel’s watch FAQ for manufacturer explanations.
Which movement is more accurate?
Quartz is generally the better choice when minimizing timekeeping deviation is the priority. The Japan Clock & Watch Association gives ±20 seconds per month as a general quartz figure and says mechanical watches may deviate by at least several seconds per day. These are broad descriptions, not guarantees for every watch; mechanical rate can vary with position, winding and temperature. The association explains these qualifications in its watch-accuracy guidance.
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Certification figures should not be confused with ordinary performance. Breitling reports COSC limits of −4 to +6 seconds per day for certified mechanical watches and ±0.07 seconds per day for certified quartz watches. These are certification-related tolerances, not promises for uncertified watches. Breitling separately specifies ±15 seconds per year for its current thermocompensated SuperQuartz models, a figure specific to those movements. Its FAQ provides those figures. Chopard gives a broad comparison of around −4 to +6 seconds per day for a luxury mechanical watch and around 0.10 seconds per day for quartz; neither figure guarantees the performance of a particular model (Chopard FAQ).
What changes when you wear a watch irregularly?
Quartz: keeps time while it has battery power
A quartz watch does not need daily wear or winding to keep running. It will eventually need a battery replacement; Chopard notes that a quartz watch that has stopped needs a new battery. Battery life depends on the watch: Chanel gives an average of two years for its J12 quartz watches, which should not be treated as a general estimate for all quartz models (Chanel FAQ).
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Mechanical: winding and power reserve matter
A manual watch needs winding. An automatic watch winds as it is worn, but it stops once its power reserve is exhausted. Published reserves vary: Chanel lists 38–42 hours for its self-winding models, while Victorinox lists 38–48 hours for its models. Use the specific watch’s stated reserve rather than applying either range to mechanical watches generally (Chanel FAQ; Victorinox FAQ).
What maintenance does each movement need?
Quartz ownership includes battery replacement; battery work can also be a reason to have water resistance checked. Victorinox recommends authorized service for battery replacement, including a water-resistance test. Mechanical watches may need a complete overhaul, but there is no single interval established for every brand: Victorinox recommends every 4–6 years for its mechanical watches, while Patek Philippe recommends service every eight to ten years for its quartz and mechanical watches. These are different makers’ recommendations, not universal schedules. Follow the instructions for the particular watch. (Victorinox FAQ; Patek Philippe watch-care recommendations.)
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How conditions can affect timekeeping
Quartz crystal timekeeping is less affected than a mechanical balance system by shocks and position, according to the Japan Clock & Watch Association, but temperature can affect quartz crystals too (JCWA accuracy guidance). Magnetism can affect mechanical watches; Seiko also notes that analog quartz movements use magnetic force in their step motors. The effect depends on the movement, so consult the watch’s manual rather than assuming that one movement type is immune to environmental influences (Seiko guidance on magnetism).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose by the trade-off you actually care about
| Your priority | Better fit | What to check |
|---|---|---|
| Timekeeping accuracy with minimal adjustment | Quartz, in general | The maker’s stated tolerance and whether a certification or specialized high-accuracy movement applies. |
| A watch that can sit unworn without needing winding | Quartz | Battery replacement requirements for the specific model. |
| Winding or wearing a spring-driven watch as part of the appeal | Mechanical | Manual versus automatic winding, stated power reserve and brand service guidance. |
| Less sensitivity to shocks and position | Quartz, generally | Temperature and magnetism can still matter; check the movement’s manual. |
The mechanical option is best understood as a preference for a spring-driven mechanism and its interaction, not a route to better accuracy. Compare the exact models’ specifications and care instructions before deciding; accuracy, running time and service needs vary by movement.
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