Why Is My Mechanical Watch Running Fast or Slow?
Identify normal variation, magnetism, position, impact, power level and service problems when a mechanical watch gains or loses time.
Small gain or loss may be within the calibre's tolerance; a sudden or large change can come from magnetism, impact, position, power level or movement condition.
Quick answer: Small gain or loss may be within the calibre's tolerance; a sudden or large change can come from magnetism, impact, position, power level or movement condition.
Why this question matters
Watch specifications are useful only when they are connected to real use. The right choice depends on fit, routine, maintenance, documented performance and the exact instructions for the model. This guide separates practical checks from marketing language so you can make a safer decision.
What to check
- Compare performance with the exact manufacturer's tolerance.
- Record rate over several consistent days.
- Note recent exposure to magnets, shocks, moisture or service.
Do not treat one specification as proof of overall quality. A watch should be judged as a complete product: case, movement, strap or bracelet, legibility, service access, written warranty and seller transparency all matter.
Step-by-step approach
- Synchronize with a reliable time source.
- Log daily difference and resting position.
- Ask a qualified watchmaker to test magnetism and rate before authorizing repair.
Keep a written record of the exact model reference, seller description and warranty terms. When a claim is model-specific, confirm it in the current instruction manual or on the manufacturer's official support page.