Understanding Mechanical Watch Accuracy: What's Acceptable?
Mechanical watch accuracy is measured in seconds per day (SPD) and varies based on movement quality. Standard-grade watches (non-COSC) typically range from -20 to +40 SPD, while COSC-certified chronometers achieve -4 to +6 SPD. High-end in-house calibers may reach -2 to +4 SPD. Factors like position, magnetism, power reserve, and maintenance affect precision. To improve accuracy, keep the watch wound, store it dial-up, demagnetize annually, and service every 5 years. If your watch consistently exceeds +60/-30 SPD, it may need servicing. Modern non-Swiss movements (like those in Wishdoit watches) can offer COSC-level precision affordably.
*"A mechanical watch isn’t about perfection—it’s about character. Even a 10-second variance means your timepiece has a unique heartbeat."
