Automatic Watch Accuracy: What “+/- 5 Seconds” Really Means

Accuracy Standards

Automatic watches typically run within -4 to +6 seconds per day when new. COSC certification guarantees -4/+6 seconds daily. Masterchronometer certification achieves 0/+5 seconds.

Factors Affecting Accuracy

Position affects rate significantly. Temperature changes timing. Magnetic fields disrupt balance wheels. Activity level impacts winding consistency.

Improving Accuracy

Regular service maintains precision. Proper storage between wears helps. Demagnetization fixes magnetic exposure. Regulation adjustments fine-tune timing.

Realistic Expectations

Most automatics stay within 10 seconds daily. Quartz accuracy far exceeds mechanical. Accept mechanical charm over precision.